Heat up waffle iron according to the instructions.
Add oats to a blender and blend for ~30-60 seconds until they turn into a fine oat flour. (Alternatively, you can use pre-made oat flour in the same measurement.)
Take your pumpkin and place it on a piece of paper towel. Add another piece of paper towel on top and press to get out some of the water. (Don’t skip this step or you’ll wind up with soggy waffles!)
Add the remaining ingredients (baking powder, sugar, eggs, pumpkin puree, milk, oil, vanilla, ½ tsp pumpkin pie spice and cinnamon) right into the blender where your oats are.
Blend until well combined. (If you’re using premade oat flour you don’t need to do this in a blender, you can whisk it! The purpose of keeping the mixing in the blender is to reduce dishes!)
Spray your hot waffle iron with nonstick spray and add your batter. (This should make about 4 waffles.)
Cook your waffles according to the waffle iron (mine has a light that says “ready” when they’re done) or until desired crisp-ness.
Remove your cooked waffles and dress them up with the greek yogurt, maple syrup and sprinkle with remaining ¼ tsp pumpkin spice. Enjoy!