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.)
Add the remaining ingredients (baking powder, sugar, eggs, greek yogurt, milk, oil, vanilla and cinnamon) right into the blender.
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 however you like and enjoy!!!!