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Preheat the oven to 425 degrees. Spray a 12-cup muffin pan with cooking spray and set aside*.
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In a bowl, mash bananas with brown sugar, vanilla extract, and cinnamon. Allow the mixture to sit for about five minutes, giving it time for the flavors to meld with each other. Then, add in Greek yogurt and egg and mix together.
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In a separate bowl, sift together four, white sugar, cocoa powder, baking soda, baking powder, and salt. Add the wet ingredients into the dry ingredients and stir until combined.
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Add in chocolate chips and mix.
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Once combined, divide batter evenly between 12-muffin cups.
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If sprinkling sugar on top of the muffins, sprinkle 1 tsp of sugar over each muffin. This allows for a nice crunchy yet soft muffin top.
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Bake at 425 for five minutes (this gives the muffin a dome shape). Then, bake at 350 for an additional 12-13 minutes or until a cake tester comes out clean.
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Enjoy!