Preheat the oven to 375F degrees. Line a muffin tin with baking cups. Set aside.in a large bowl mash the bananas with a fork or use a hand mixer. Mash them very well – no big lumps. Stir in the sugar, egg whites, greek yogurt, and vanilla extract.Sift the flours, cocoa powder, salt, baking soda and baking powder. Slowly stir in the wet ingredients, being careful not to overmix. Fold in chocolate chips. The batter will be a little chunky.
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