Preheat and prep: Heat your oven to 350°F (175°C). Line a 12-cup muffin tin with paper liners or lightly grease each cup.
Mix the dry ingredients: In a large bowl, whisk 1 cup white whole wheat flour (or oat flour), 1/2 cup rolled oats, 1 scoop (about 30 g) protein powder, 1 1/2 teaspoons baking powder, 1/2 teaspoon baking soda, 1/2 teaspoon salt, and 2 to 3 teaspoons pumpkin pie spice.
Blend the wet ingredients: In a separate bowl, whisk 1 cup pumpkin puree, 2 eggs, 1/2 cup Greek yogurt, 1/3 cup maple syrup, 2 tablespoons oil, and 1 teaspoon vanilla extract until smooth.
Combine gently: Pour the wet mixture into the dry ingredients.
Stir with a spatula until just combined. Do not overmix—a few small lumps are fine.
Add mix-ins (optional): Fold in 1/3 cup mini chocolate chips, nuts, or raisins if you like.
Fill the tin: Divide the batter evenly among the 12 cups. The batter will be thick. Sprinkle pumpkin seeds or a light oat crumble on top if you want extra texture.
Bake: Bake for 16–20 minutes, or until a toothpick comes out clean or with a few moist crumbs.
Tops should spring back when lightly pressed.
Cool: Let the muffins rest in the pan for 5 minutes, then transfer to a wire rack to cool completely. Cooling helps the structure set, especially with protein bakes.