Prep your pan and oven: Heat the oven to 350°F (175°C). Line a 12-cup muffin tin with liners or lightly grease it.
Whisk the wet ingredients: In a large bowl, whisk pumpkin puree, eggs, Greek yogurt, maple syrup, oil, and vanilla until smooth.
Blend or pulse the oats (optional): For a softer crumb, pulse the oats a few times in a blender.
Leave them whole if you want more texture.
Combine the dry ingredients: In a separate bowl, stir together oats, flour, protein powder, pumpkin pie spice, baking powder, baking soda, and salt.
Bring it together: Add the dry mixture to the wet ingredients. Stir gently until just combined. Avoid overmixing to keep muffins tender.
Fold in extras: If using chocolate chips, nuts, or pepitas, fold them in.
The batter will be thick—that’s normal.
Fill the tin: Divide the batter evenly among the muffin cups, filling each about 3/4 full.
Bake: Bake for 17–22 minutes, or until the tops are set and a toothpick comes out with a few moist crumbs.
Cool: Let muffins cool in the pan for 5 minutes, then transfer to a wire rack. Cooling helps them set and improves texture.
Enjoy: Serve warm or at room temperature. A swipe of almond butter on top is excellent.