Preheat oven to 375F. Line a 9x13-inch baking dish with parchment paper or lightly grease it.
Blend the cottage cheese until completely smooth.
In a large bowl, combine the applesauce, egg whites, blended cottage cheese, milk, maple syrup, and vanilla.
Add the quick oats, 2 tsp cinnamon, salt, baking powder, and baking soda. Stir until well combined.
Fold in 2 cups of the chopped apples.
Let the mixture sit for about 5 minutes so the oats can absorb some of the liquid.
Pour the mixture into the prepared baking dish and spread evenly.
Sprinkle the remaining 1 cup chopped apples, remaining 1/2 tsp cinnamon, and chopped pecans over the top.
Bake for 40–50 minutes, until the center is set and the top is lightly golden.
Let cool for 10–15 minutes, then cut into 9 pieces.
Serve each slice with 2 tbsp Greek yogurt on top.