Blend (optional for smooth texture): In a small blender or food processor, blend cottage cheese, pumpkin, egg, and sweetener until smooth. (Or mash/stir well by hand if you don’t mind a little texture.)
Add dry ingredients: Stir in oat flour, cinnamon, pumpkin spice, baking powder, and a pinch of salt. Fold in chocolate chips or nuts if using.
Microwave: Pour into a greased or microwave-safe mug or ramekin. Microwave on high for 1 minute 30 seconds to 2 minutes, depending on your microwave’s strength. It should puff up and set on top.
Cool & serve: Let cool for a minute or two. Enjoy as-is or top with Greek yogurt or whipped cream, a drizzle of maple syrup, extra cinnamon or nut butter.