Preheat oven to 350°F (175°C). Lightly grease or line an 8×8-inch baking dish with parchment paper.
Blend wet ingredients: In a blender or food processor, combine pumpkin purée, cottage cheese, eggs, maple syrup, and vanilla extract. Blend until smooth and creamy.
Add dry ingredients: Pour the blended mixture into a mixing bowl. Stir in oats, protein powder, pumpkin pie spice, cinnamon, baking powder, and salt. Mix until evenly combined.
Pour and bake: Spread the batter into the prepared baking dish. Bake for 35–40 minutes, or until the center is set and edges are lightly golden.
Cool and slice: Let cool for 15 minutes before cutting into squares. Serve warm or store for later.