01 - Preheat oven to 375°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together flour, cocoa powder, baking powder, baking soda, and salt until evenly mixed.
03 - In a large bowl, whisk granulated sugar, brown sugar, milk, Greek yogurt or sour cream, vegetable oil, eggs, and vanilla extract until smooth and homogenous.
04 - Gradually add dry ingredients to the wet mixture, stirring gently until just combined to avoid overmixing.
05 - Fold chocolate chips into the batter ensuring even distribution.
06 - Using a large cookie scoop or 1/4 cup measuring cup, drop batter onto prepared baking sheets, spacing mounds adequately.
07 - Top each muffin top with additional chocolate chips if desired.
08 - Bake for 10 to 12 minutes, or until tops are set and a toothpick inserted comes out with a few moist crumbs.
09 - Let muffin tops rest on the baking sheets for 5 minutes before transferring to a wire rack to cool completely.