Preheat your waffle iron to medium-high heat for 3–5 minutes. You'll know it's ready when a few drops of water sizzle immediately upon contact. Lightly butter or spray both plates with a high-heat cooking spray to prevent sticking.
In a blender or food processor, add 1 cup cottage cheese, 3 large room-temperature eggs, 1/2 cup whole milk, 2 tablespoons melted unsalted butter, and 1 teaspoon vanilla extract. Blend on high speed for 60–90 seconds, scraping down the sides once halfway through, until the mixture is completely smooth with no visible cottage cheese curds. The batter should look like slightly thick pancake batter.
Checkpoint: You are ready to move on when the cottage cheese batter looks uniform and pours smoothly from a spoon without visible lumps.
In a medium mixing bowl, whisk together 1/2 cup all-purpose flour, 1/4 cup granulated sugar, 1/2 teaspoon baking powder, 1/4 teaspoon salt, and 1/4 teaspoon ground cinnamon. Whisk for 15–20 seconds to combine thoroughly and aerate the flour slightly.
Pour the blended cottage cheese mixture into the dry ingredients and gently fold together using a rubber spatula, making 8–10 slow folding motions. Stop as soon as you don't see white flour streaks. The batter should look slightly lumpy with some flour-white areas visible — this is correct. Do not overmix or the waffles will be tough.
Checkpoint: You are ready to move on when dry ingredients are mostly incorporated but small flour lumps remain visible. The batter should pour easily but not be smooth or completely homogeneous.
Open the hot waffle iron carefully. Pour approximately 3/4 cup batter (about the size of an ice cream scoop or a golf ball) into the center of the lower plate. Close the lid gently and do not open it to peek.
Cook for 4–5 minutes until the steaming from the edges has stopped completely and the waffle is deep golden brown on the outside. The steam will slow significantly around the 3-minute mark. If you open too early, the waffle will be soggy inside.
Checkpoint: You are ready to remove the waffle when no steam emerges from the edges for 10 seconds and the exterior is golden to deep golden brown (not pale yellow).
Using a heat-resistant fork or wooden spatula (not metal, which can scrape the waffle iron), gently pry the waffle from the iron, starting at one corner and working around the edges. Slide it onto a cooling rack — never stack it on a plate, as trapped steam will make it soggy.
Immediately return to step 7 and repeat with remaining batter. Work quickly while the iron stays hot. The batter will sit for 5–10 minutes without issue, but do not refrigerate the mixed batter.
If waffles cool slightly while you finish the batch, warm them in a 200°F oven for 5 minutes before serving, or pop them in a toaster at medium setting for 30–45 seconds.
Serve warm waffles immediately with your desired toppings: fresh berries, Greek yogurt, maple syrup, whipped cream, sliced fruit, honey, or nut butter.