01 -
Preheat oven to 350°F.
02 -
Combine milk, bananas, and spinach in a high-powered blender and blend until mostly smooth. Transfer the mixture to a large mixing bowl.
03 -
Add the egg to the blended mixture and lightly whisk. Stir in sugar, vanilla extract, oil, and Greek yogurt until combined.
04 -
In a small bowl, combine flour, baking soda, sea salt, and cocoa powder. Stir to combine.
05 -
Slowly add the dry ingredient mixture to the wet ingredients and fold together. Stir in chocolate chips, reserving a few for topping if desired.
06 -
Line a 12-count muffin pan with muffin liners. Spoon the batter into each liner and top with additional chocolate chips if desired.
07 -
Bake for 18-22 minutes or until a toothpick inserted in the center of a muffin comes out clean.
08 -
Allow muffins to cool for several minutes before serving.