Preheat your oven to 350°F (175°C). This ensures that your protein muffins will rise perfectly.
Grease a muffin tin or line it with muffin liners to prevent sticking. This step is crucial for easy removal after baking.
In a large mixing bowl, combine the 3 large eggs, 1 cup cottage cheese, 1/2 cup melted butter, 1 tablespoon lemon juice, and 1 teaspoon vanilla extract. Whisk until smooth and well combined.
In a separate bowl, whisk together the 1.25 cups almond flour, 1/2 cup whey protein powder, 1/4 cup granulated sweetener, 1 tablespoon baking powder, and 2 teaspoons lemon zest. This ensures even distribution of the dry ingredients.
Gradually add the dry mixture to the wet mixture, stirring until just combined. Be careful not to overmix, as this can result in dense muffins.
Gently fold in the 1/2 cup fresh blueberries to the batter. This adds a burst of flavor and sweetness in every bite.
Using a spoon or ice cream scoop, fill each muffin cup about 3/4 full with the batter. This allows room for the muffins to rise without overflowing.
Place the muffin tin in the preheated oven and bake for 18-20 minutes, or until a toothpick inserted into the center comes out clean. The tops should be golden brown and slightly springy to the touch.
Once baked, remove the protein muffins from the oven and let them cool in the tin for a few minutes before transferring them to a wire rack. Enjoy them warm or store them for later!