Preheat oven to 350°F (175°C). Line or grease a 12-cup muffin tin.
Blend cottage cheese, eggs, pumpkin puree, sweetener, and vanilla until smooth.
In a bowl, whisk oat flour, protein powder, baking powder, pumpkin pie spice, and salt.
Pour wet mixture into dry. Stir gently until just combined. Add 1–2 tbsp milk if batter is too thick.
Spoon batter into muffin cups, filling about ¾ full.
Bake 18–20 minutes or until toothpick comes out clean.
Cool 5 minutes in tin, then transfer to rack to finish cooling.
