Blend the dry ingredients: Add rolled oats, baking powder, salt, and ground cinnamon into your blender and blend until the oats resemble a fine flour. Transfer to a large mixing bowl.

Combine the wet ingredients: In the same blender, add mashed ripe bananas, eggs, melted coconut oil, maple syrup (or honey), fresh spinach, and vanilla extract. Blend on high until smooth, around 1 to 2 minutes.

Mix dry and wet ingredients: Pour the wet mixture back into your bowl with the dry ingredients. Stir together gently with a spatula until just combined, ensuring not to overmix.

Preheat the waffle iron: Preheat your waffle iron according to the manufacturer’s instructions, lightly greasing if necessary.

Cook the waffles: Pour about ½ cup of batter onto the center of the iron, spreading it slightly, and cook for 4 to 6 minutes until golden brown. Avoid opening the iron too soon.

Keep waffles warm: Remove cooked waffles and place them in a preheated oven set at 200°F to keep warm while finishing the batch.