Prepare the crust: Preheat nothing—this is no bake! In a medium bowl, combine 2 cups graham cracker crumbs, 6 tablespoons melted butter, and 3 tablespoons sugar. Stir with a fork until the mixture resembles coarse wet sand, about 1 minute. Checkpoint: The mixture should hold together when squeezed but still look crumbly.

Press crust into pie dish: Pour the graham cracker mixture into a 9-inch pie dish. Using the bottom of a measuring cup or your fingers, press firmly and evenly across the bottom and up the sides to create a compact, even layer, about 1/4 inch thick. Make sure the edges are reinforced so they don't crumble when slicing. Checkpoint: The crust should feel firm and hold together without gaps.

Chill the crust: Place the pie dish in the refrigerator for 15 minutes. This allows the butter to set and the crust to firm up. Checkpoint: The crust should feel dry to the touch and solid when you tap it.

Soften the cream cheese: Remove an 8-ounce package of cream cheese from the refrigerator and let it sit on the counter for 10–15 minutes until it's soft enough to beat easily. Cut into chunks if you want to speed this up. Checkpoint: The cream cheese should be soft enough to blend easily with a mixer but not greasy or warm.

Beat the cream cheese: Add the softened cream cheese to a large mixing bowl. Using an electric mixer on medium speed, beat for 2 minutes until completely smooth and creamy, scraping down the sides of the bowl halfway through. Do not overmix or the texture will become grainy. Checkpoint: The cream cheese should be light, fluffy, and free of lumps.

Whip the heavy cream: In a separate, very clean bowl (even tiny bits of cream cheese will prevent proper whipping), pour 1 cup heavy whipping cream. Using the mixer on high speed, whip for 2–3 minutes while gradually adding 1/2 cup powdered sugar and 1 teaspoon vanilla extract. Whip until stiff peaks form—when you lift the beaters, the peaks should stand straight up without flopping. Checkpoint: The whipped cream should be thick, white, and hold its shape in stiff peaks.

Fold whipped cream into cream cheese: Using a silicone spatula, gently scoop the whipped cream on top of the beaten cream cheese. Using a folding motion (cut down the center, sweep along the bottom, fold up and over), combine the two until no white streaks of whipped cream are visible. Work gently to keep the mixture light and airy—do not stir or beat. This should take about 1 minute. Checkpoint: The filling should be smooth, fluffy, and slightly lighter in color than the original cream cheese.

Spread filling into crust: Pour the cream cheese mixture into the chilled crust. Using an offset spatula or the back of a spoon, spread evenly across the bottom and smooth the top into a level surface. The filling should reach just below the rim of the crust. Checkpoint: The filling should look even and smooth with no graham cracker showing through.

Refrigerate the filling: Place the pie in the refrigerator while you prepare the blueberry topping. This takes about 10–15 minutes and helps the filling stay cold and firm when you add the warm topping. Checkpoint: The cream filling should feel cold to the touch when you return.

Cook the blueberry base: In a small saucepan, combine 1 cup fresh blueberries, 1/4 cup sugar, and 1/4 cup water. Place on the stove over medium heat (about 350°F if you have an electric stove). Stir occasionally with a wooden spoon. Cook for 5–7 minutes until most of the berries have burst and released their juice. The liquid should be deep purple and bubbling gently. The mixture will smell sweet and fruity. Checkpoint: The berries should be mostly broken down into a jammy texture with visible juice.

Thicken the blueberry mixture: While the berries cook, mix 1 tablespoon cornstarch with 2 tablespoons fresh lemon juice in a small cup to form a smooth paste—no lumps. When the berries are soft (around minute 6), slowly pour the cornstarch slurry into the hot blueberry pan while stirring continuously. Cook for an additional 1–2 minutes, stirring constantly, until the mixture thickens and becomes glossy and translucent. It should coat the back of a spoon. Checkpoint: The mixture should be thick enough that a line drawn through it on the spoon stays visible for 2 seconds.

Finish the blueberry topping: Remove from heat and stir in 1/4 teaspoon salt. This enhances the fruit flavor and balances sweetness. Set the saucepan aside and let the blueberry mixture cool to room temperature, about 15–20 minutes. Stir occasionally to help it cool faster. It should no longer feel hot to the touch when you dip a spoon in. Checkpoint: The mixture should be warm or cool enough that it won't melt the cream filling when you spread it.

Fold in fresh blueberries: When the cooked blueberry mixture has cooled, gently fold in 2 cups fresh whole blueberries using a spatula. Use a gentle folding motion to avoid crushing the fresh berries. Some may break slightly from the residual heat, but most should remain whole and firm. Checkpoint: You should see whole blueberries suspended throughout a glossy purple sauce.

Spread topping on pie: Remove the chilled pie from the refrigerator. Carefully spoon the blueberry mixture onto the cream filling, working from the center outward. Use the spatula to spread gently and evenly, ensuring the topping covers the filling without going over the crust edge. Checkpoint: The blueberry topping should be evenly distributed with whole berries visible on top.

Final chill: Place the completed pie back in the refrigerator for at least 3 hours (or up to 2 days, covered loosely with plastic wrap). This allows the filling to set completely so slices cut cleanly. The flavors will also meld and improve during this time. Checkpoint: The filling should be firm enough that a knife inserted and withdrawn comes out clean, and the whole pie feels very cold.

Slice and serve: Remove the pie from the refrigerator 10 minutes before serving to allow it to warm slightly for easier slicing and better flavor. Using a sharp knife dipped in hot water and wiped clean between slices, cut the pie into 6–8 slices. The slices should cut cleanly without the filling squishing. Serve immediately on chilled plates. Checkpoint: Slices should be clean and neat, with layers clearly visible: golden crust, white creamy filling, and glossy purple berry topping.