Banana Sheet Cake Recipe with Brown Sugar Frosting

There’s nothing quite like a slice of homemade banana sheet cake that’s moist, tender, and bursting with natural fruit flavor. This classic dessert is a beloved favorite for family gatherings, potlucks, and everyday indulgences. The cake itself is wonderfully soft and packed with the subtle sweetness of ripe bananas, while the rich brown sugar frosting on top adds a luxurious, caramel-like finish. This recipe serves a crowd and comes together easily, making it perfect for bakers of all skill levels looking to impress without fussing over complicated techniques.

Reasons to Try Banana Sheet Cake

This banana sheet cake stands out for several compelling reasons:

• Naturally Moist and Tender: The mashed bananas keep every bite incredibly moist without requiring extra oil or sour cream, ensuring the cake stays fresh and delicious for days.
• Rich Brown Sugar Frosting: Unlike standard vanilla frosting, the cooked brown sugar frosting has a deep, complex flavor with hints of caramel and toffee that perfectly complements the banana cake.
• Crowd-Pleasing Flavor: Banana is a universally loved flavor that appeals to both adults and children, making this cake ideal for any celebration.
• Easy Sheet Pan Format: Baking in a 13×9-inch pan means faster baking time, easier frosting, and perfect portions for serving a large group.
• Feeds a Crowd: This recipe yields 15 generous servings, making it economical and practical for family gatherings, church socials, or office celebrations.
• Beginner-Friendly: The straightforward mixing method and simple ingredients make this cake accessible to bakers of all experience levels.

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Ingredients Notes

For the Cake

• shortening
• packed brown sugar
• sugar
• eggs
• mashed ripe banana
• vanilla
• all-purpose flour
• baking soda
• salt
• buttermilk
• chopped nuts

For the Frosting

• packed brown sugar
• butter
• milk
• powdered sugar

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How to Make Banana Sheet Cake

For the Cake

1. Cream together shortening and both sugars until light and fluffy.
2. Add eggs one at a time, beating well after each addition.
3. Mix in mashed bananas and vanilla until combined.
4. In a separate bowl, whisk together flour, baking soda, and salt.
5. Add the dry ingredients to the banana mixture alternately with buttermilk, starting and ending with dry ingredients.
6. Stir in chopped nuts.
7. Pour batter into a prepared 13×9-inch pan.
8. Bake at 350°F for 25–30 minutes until a toothpick inserted near the center comes out clean.
9. Cool completely before frosting.

For the Frosting

1. Combine brown sugar, butter, and milk in a saucepan.
2. Bring to a boil over medium heat, stirring constantly for 2 minutes.
3. Remove from heat and cool slightly.
4. Gradually beat in powdered sugar until the frosting reaches spreading consistency.
5. Frost the cooled cake and serve.

What You Must Know About Banana Sheet Cake

Understanding a few critical details will help you succeed with this recipe:

• Use Ripe Bananas: The bananas must be ripe with brown speckles on the skin. Green or barely ripe bananas lack sweetness and moisture. Overripe (almost black) bananas are ideal for maximum flavor and moisture.
• Mash Bananas Thoroughly: Break down the bananas completely so they incorporate smoothly into the batter. Small chunks can create uneven texture in the finished cake.
• Don’t Overmix the Batter: Once you add the dry ingredients, mix only until combined. Overmixing develops too much gluten, resulting in a tough, dense cake instead of a tender crumb.
• Cool the Cake Completely: Frosting a warm cake will cause the frosting to melt and slide off. Allow at least 2 hours of cooling time in the pan before applying frosting.
• Boil the Frosting Precisely: The brown sugar frosting must boil for exactly 2 minutes to develop the right consistency and flavor. Less time and it won’t thicken properly; more time and it becomes hard and grainy.
• Cool the Frosting Before Adding Powdered Sugar: Adding powdered sugar to a hot frosting creates lumps and a grainy texture. Wait until the mixture is warm but not hot—you should be able to hold your hand over the pan comfortably.

Helpful Tips: For extra moisture, you can add an additional tablespoon or two of buttermilk to the batter. If you prefer your frosting thicker and fudgier, use the full 3 cups of powdered sugar. For a nuttier flavor, toast the nuts in a dry skillet over medium heat for 2–3 minutes before adding them to the batter. You can also substitute chopped pecans for walnuts if you prefer.

Variations and Substitutions

• Chocolate Banana Sheet Cake: Add 1/3 cup unsweetened cocoa powder to the dry ingredients. This creates a delicious chocolate-banana combination that appeals to chocolate lovers.
• Walnut or Pecan Options: Choose your preferred nut based on taste. Walnuts add an earthier flavor, while pecans are slightly sweeter and more buttery. You can also use macadamia nuts for a tropical twist.
• No-Nut Version: Simply omit the nuts if you have allergies or preferences. The cake is equally delicious without them.
• Oil Instead of Shortening: Substitute vegetable oil for the shortening in equal measure. Use 1/2 cup oil instead of 1/2 cup shortening. The cake will be slightly lighter and more moist.
• Caramel-Cream Cheese Frosting: For a tangier frosting, mix 4 ounces softened cream cheese with the cooked brown sugar mixture before adding powdered sugar. This adds richness and a slight tang that complements banana well.
• Maple-Brown Sugar Frosting: Add 1–2 tablespoons pure maple syrup when boiling the brown sugar mixture for a deeper, more complex maple flavor.
• Peanut Butter Frosting Alternative: Replace the brown sugar frosting with a simple peanut butter frosting by creaming together 1/2 cup peanut butter with 1/4 cup softened butter, then beating in 2 cups powdered sugar and a pinch of salt.

Serving Suggestions for Banana Sheet Cake

• Classic Presentation: Slice the frosted cake into 15 equal squares and serve directly from the pan on small dessert plates. A simple presentation lets the banana flavor shine.
• Garnished with Nuts: After frosting, sprinkle extra chopped walnuts or pecans on top for added texture and a visual finish that hints at what’s inside.
• Fresh Banana Slice Topper: Just before serving, arrange thin banana slices on top of individual servings for a fresh, elegant touch. Toss the slices lightly in lemon juice to prevent browning.
• Drizzle with Caramel Sauce: Add a light drizzle of warm caramel sauce over frosted squares for extra indulgence and visual appeal.
• Whipped Cream Accompaniment: Serve each slice with a dollop of freshly whipped cream or vanilla ice cream on the side. The cool creaminess contrasts beautifully with the warm, moist cake.
• Coffee Shop Style: Dust the frosted cake lightly with cinnamon or cocoa powder before serving for a warm spice note that enhances the banana flavor.
• Party Platter: Leave the cake in the pan and set it on a dessert table with a serving knife and small plates nearby, allowing guests to cut their own slices.

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Storage and Reheating

Room Temperature Storage: Keep the frosted cake in the 13×9-inch pan and cover it tightly with plastic wrap or aluminum foil. Store at room temperature for up to 3 days. The cake stays moist and the frosting remains spreadable.

Refrigerator Storage: For longer storage, cover the pan with plastic wrap and refrigerate for up to 1 week. The cake will firm up slightly when cold, making slices easier to remove. Allow slices to sit at room temperature for 15–20 minutes before serving for the best texture and flavor.

Freezer Storage: To freeze, cool the cake completely, then wrap individual slices or the entire cake in plastic wrap, then aluminum foil. Label with the date and freeze for up to 3 months. Thaw at room temperature for 2–3 hours before serving. Do not freeze the frosted cake for more than 3 months, as the frosting texture may change slightly.

Reheating (Optional): This cake is best served at room temperature or chilled and does not require reheating. However, if you prefer warm cake, you can microwave individual slices on low power (30% power) for 15–20 seconds until warmed through. Do not overheat, as the frosting may melt.

Nutrition Facts (Per Serving)

*Nutrition facts are approximate per serving based on standard ingredients. Values may vary depending on specific brands and preparation methods. This information is intended as a general guide and should not replace professional nutritional advice.

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Banana Sheet Cake

Easy banana sheet cake recipe with rich brown sugar frosting. Moist, tender, and feeds 15 people. Perfect for gatherings. Step-by-step instructions included.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 28 minutes mins

Total Time 43 minutes mins

Course Dessert

Cuisine American

Servings 15 servings

Calories 285 kcal

Ingredients

  

• shortening
• packed brown sugar
• sugar
• eggs
• mashed ripe banana
• vanilla
• all-purpose flour
• baking soda
• salt
• buttermilk
• chopped nuts
• butter
• milk
• powdered sugar

Instructions

 

• Preheat oven to 350°F. Spray a 13x9-inch baking pan with vegetable oil cooking spray and set aside (5 minutes prep time).
• In a large bowl, cream together 1/2 cup shortening, 3/4 cup packed brown sugar, and 1/2 cup sugar using an electric mixer on medium speed until the mixture is light, fluffy, and pale in color, about 2–3 minutes. Checkpoint: The mixture should look creamy and slightly increased in volume.
• Add 2 eggs one at a time to the creamed mixture, beating well for about 30 seconds after each egg is added. The mixture should be smooth and well combined. Checkpoint: No streaks of egg should be visible.
• Mix in 1 cup mashed ripe banana (about 2–3 medium bananas) and 1 teaspoon vanilla extract, stirring until fully combined, about 1 minute. The batter will appear slightly curdled—this is normal. Checkpoint: The banana is evenly distributed throughout.
• In a separate small bowl, whisk together 2 cups all-purpose flour, 1 teaspoon baking soda, and 1 teaspoon salt until well combined, about 30 seconds. Checkpoint: No lumps of baking soda should remain.
• Add half of the dry flour mixture (about 1 cup) to the banana mixture, stirring with a spatula until just combined, about 30 seconds. Do not overmix.
• Add 1/2 cup buttermilk to the batter, stirring until just combined, about 30 seconds.
• Add the remaining dry flour mixture (about 1 cup) to the batter, stirring until just combined, about 30 seconds. The batter should be smooth with no visible streaks of flour. Checkpoint: The batter is thick, creamy, and well combined.
• Stir in 1/2 cup chopped nuts (walnuts or pecans work well) until evenly distributed, about 30 seconds. Checkpoint: Nuts are scattered throughout the batter.
• Pour the entire batter into the prepared 13x9-inch pan, using a spatula to smooth the top into an even layer, about 1 minute.
• Place the pan on the center rack of the preheated 350°F oven and bake for 25–30 minutes. The cake is done when a toothpick inserted near the center comes out clean or with just a few moist crumbs attached. The top should be light golden brown and spring back slightly when lightly touched. Checkpoint: A toothpick inserted in the center shows no wet batter.
• Remove the cake from the oven and place on a wire cooling rack. Let cool completely in the pan at room temperature for at least 2 hours before frosting. This allows the cake to set and makes frosting easier. Checkpoint: The cake is completely cool to the touch.
• While the cake cools, prepare the frosting. In a medium saucepan, combine 1/2 cup packed brown sugar, 1/4 cup butter, and 6 tablespoons milk.
• Place the saucepan over medium heat and stir constantly until the mixture reaches a gentle boil, about 3–5 minutes. Checkpoint: The mixture is bubbling gently around the edges.
• Once boiling, continue to stir constantly for exactly 2 minutes. The frosting will darken slightly and thicken. Checkpoint: A spoon dipped in the mixture coats slightly.
• Remove the saucepan from heat and let the frosting cool at room temperature for about 5–10 minutes, stirring occasionally. The frosting should be warm but not hot when you add the powdered sugar. Checkpoint: You can hold your hand over the pan without it being too uncomfortable.
• Gradually add 2 1/2 to 3 cups powdered sugar (start with 2 1/2 cups) to the cooled brown sugar mixture, beating with an electric mixer on medium speed. Add powdered sugar slowly to avoid lumps, about 1–2 minutes total. Checkpoint: The frosting is smooth, creamy, and spreadable—not too thick or runny.
• If the frosting is too thin and won't hold its shape, add more powdered sugar 1 tablespoon at a time until it reaches the right consistency. If it's too thick, add milk 1 teaspoon at a time. Checkpoint: The frosting is thick enough to hold peaks but spreads easily on the cake.
• Using an offset spatula or regular knife, spread the frosting evenly over the top of the completely cooled cake, working quickly before the frosting sets, about 2–3 minutes. Checkpoint: The frosting is smoothly applied and covers the cake evenly.
• Allow the frosted cake to set for about 30 minutes to 1 hour before cutting and serving. This helps the frosting firm up slightly. Checkpoint: The frosting holds its shape when you press it gently.

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