Preheat oven to 350 degrees.
Combine egg, egg whites, pumpkin, pie spice, and stevia in blender until well combined.
Pour batter into a silicone loaf pan.
Sprinkle cinnamon lightly on top.
Bake for 40-45 minutes (or microwave 6-8 minutes).
Remove from oven and allow to cool slightly.
Slice in half, to make 2 equal rectangles, then slice each diagonally to form 4 triangular slices.
Place slices in toaster oven on a piece of parchment paper or foil and toast until lightly browned.