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Preheat oven to 350°F.
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Whisk together the first six ingredients in a large bowl: flour, sugar, cocoa powder, baking soda, salt, and baking powder.
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In a medium bowl, whisk together banana, yogurt, oil, applesauce, and egg until blended.
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Add to your flour mixture and stir just until moistened.
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Fold in chocolate chips.
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Grab a muffin pan fit for a dozen and line with paper or parchment muffin cups three-fourths full.
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Bake on center rack until a toothpick inserted in center comes out clean, approx. 20-25 minutes.
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Cool 5 minutes in pan, then transfer to a wire rack. Serve warm.