01 - Preheat oven to 375°F. Line a 12-cup muffin tin with paper liners or grease lightly with cooking spray.
02 - In a large mixing bowl, whisk together flour, cocoa powder, sugar, baking powder, baking soda, and salt until well blended.
03 - In a separate bowl, whisk eggs, milk, vegetable oil, and vanilla extract until smooth and fully incorporated.
04 - Pour the wet ingredients into the dry ingredients. Mix gently with a spatula until just combined—do not overmix as this will result in tough muffins.
05 - Gently fold in the diced strawberries and semi-sweet chocolate chips until evenly distributed throughout the batter.
06 - Divide the batter evenly among the prepared muffin cups, filling each approximately 3/4 full.
07 - Sprinkle mini chocolate chips over the top of each muffin for an extra chocolate crunch, if desired.
08 - Bake for 18 to 22 minutes, or until a toothpick inserted into the center of a muffin comes out with a few moist crumbs attached.
09 - Let muffins cool in the tin for 5 minutes before transferring to a wire rack to cool completely.