Spray a microwave safe cereal bowl with cooking spray and add the peanut flour and baking powder and mix well.
Add the canned pumpkin and 2 egg whites and mix VERY well until all ingredients are incorporated.
Add the cinnamon and put into the microwave for 2-4 minutes, depending on the power. I put it for approximately 3 minutes (I use a 850watt microwave), but watch it and ensure it puffs up and is fully cooked. Overcooking it will result in a more drier texture.
Allow cool, slice in half, and top with cheese/nut butter or eat it as itself.
Notes
I usually omit the stevia as I like the peanut flavour of it, and often top it with savoury toppings like cheese (as pictured) or pesto. However, if you like a sweeter muffin, add the stevia and top with a nut butter for a filling, clean snack!