Ultra-moist and fudgy inside and loaded up with a double-whammy of chocolate, you'd never guess that these brownie-like muffins are lighter on the calories!
Preheat oven to 425F. Lightly grease a 12-cup muffin tin OR line cups with muffin liners. Set aside.
In a large bowl, beat oil, sugar, yogurt, buttermilk, eggs, and vanilla until smooth. In a separate medium bowl, combine flour, cocoa, baking powder, and salt. Gently fold flour mixture into liquid until just combined. Fold in chocolate chips. (batter will be slightly thin)
Fill prepared muffin cups to brim with batter. Bake muffins at 425F 5 minutes, then reduce heat to 375F and continue baking 14-15 minutes or until a toothpick comes out with moist crumbs sticking to it.
Cool muffins in pan 10 minutes, then transfer muffins to a cooling rack to cool completely. Enjoy!
Notes
Store muffins in an airtight container at room temperature up to 3 days. Muffins also freeze very well up to 2 months.