Preheat oven to 350°F and lightly grease an 8x8-inch baking dish.
In a large bowl, mix mashed bananas, eggs, milk, Greek yogurt, and maple syrup until well combined.
Stir in rolled oats, protein powder, cinnamon, ginger, nutmeg, baking powder, and salt.
Fold in grated carrot and chopped walnuts.
Pour into the prepared baking dish and spread evenly.
Bake for 30–35 minutes, until the center is set and the edges are lightly golden.
Let cool for 15–20 minutes.
Blend cottage cheese, Greek yogurt, and vanilla until completely smooth.
Spread the cottage cheese topping over the cooled baked oats.
Drizzle 2 tbsp honey over the top, then dust with ground cinnamon.
Scoop 6 servings and serve.