01 -
Set the oven to 350°F (175°C) to reach optimal baking temperature.
02 -
Combine milk, ripe bananas, and spinach in a high-powered blender; blend until mostly smooth with slight texture remaining. Transfer to a large bowl.
03 -
Whisk the egg into the blended mixture, then stir in sugar, vanilla extract, oil, and Greek yogurt until evenly combined.
04 -
In a separate bowl, blend the flour, baking soda, cocoa powder, and sea salt until uniform.
05 -
Gradually fold dry ingredients into the wet mixture to avoid overmixing; gently fold in dark chocolate chips, reserving some to top muffins if desired.
06 -
Line a 12-cup muffin pan with liners. Spoon batter evenly into cups and sprinkle remaining chocolate chips on top if preferred.
07 -
Bake for 18-22 minutes until a toothpick inserted in the center comes out clean.
08 -
Allow muffins to cool for several minutes in the pan before removing; serve warm or at room temperature.