Preheat: plug waffle iron and turn to medium heat.
Dry Ingredients: in a medium bowl, stir together the flour, baking powder, cinnamon and salt.
Wet Ingredients: in a blender, add in the eggs, milk, oil, applesauce, vanilla extract and spinach. Blend for 1 minute on medium speed or until the spinach is completely blended.
Mix: add the spinach mixture to the flour mixture and stir until just combined.
Cook: pour waffle mixture onto waffle iron in 1/4 cup increments and bake according to the waffle maker's instructions.
Serve: let cool slightly and serve, or store in an air-tight container in the fridge or freezer.