These Oatmeal Green Smoothie Muffins are so easy to make, perfectly sweet, and made with so many good-for-you ingredients! Great as a healthy breakfast or snack, these muffins are hearty thanks to ground oats, sweetened with banana and a little maple syrup or honey, and packed with 2 cups of spinach! With over a hundred 5-star ratings, these spinach banana muffins are a must-make!