Preheat your oven to 350°F (175°C). Lightly grease a 9×9-inch baking dish or line it with parchment paper.

Add the cottage cheese to a blender or food processor and blend for about 45 seconds until completely smooth.

Peel and dice the apples, then mash about half for moisture and leave the rest in small chunks. Toss with cinnamon to coat evenly.

In a large bowl, whisk together the blended cottage cheese, Greek yogurt, eggs, maple syrup (or honey), and vanilla extract until smooth.

In another bowl, mix oats, protein powder (if using), baking powder, salt, and remaining cinnamon.

Gently fold the dry ingredients into the wet mixture until just combined, avoiding overmixing.

Fold in the mashed and diced apples evenly.

Pour batter into the prepared baking dish and smooth the top. Bake for 40-45 minutes until golden brown and a toothpick inserted in the center comes out with moist crumbs.

Let cool completely before slicing to ensure it holds together perfectly.