01 -
Set your oven to 350°F (175°C) and let it get hot.
02 -
Toss spinach, bananas, and milk into a blender. Blend until almost smooth (tiny bits are fine). Pour this into a big bowl.
03 -
Crack the egg into the bowl and lightly whisk it into the mix. Stir in yogurt, sugar, oil, and vanilla until it's all blended nicely.
04 -
In another bowl, whisk cocoa, flour, salt, and baking soda together until it looks even.
05 -
Slowly add the dry mix into the wet bowl. Stir gently until they're just combined. Throw in the chocolate chips, saving a few for topping, if you want.
06 -
Line up a 12-slot muffin tin with baking cups and split the batter between them. Scatter extra chocolate chips on top if you'd like.
07 -
Pop the muffin tray into the oven for 18-22 minutes. Check if they're done by poking with a toothpick—it should come out clean.
08 -
Let the muffins sit in the pan for a bit. Then move them to a cooling rack to finish cooling off.