01 - Preheat oven to 375°F. Line a 12-cup muffin tin with paper liners or grease lightly.
02 - In a large bowl, whisk together flour, cocoa powder, sugar, baking powder, baking soda, and salt.
03 - In a separate bowl, whisk eggs, milk, oil, and vanilla extract until smooth.
04 - Pour the wet ingredients into the dry ingredients and mix gently until just combined. Do not overmix.
05 - Fold in diced strawberries and semi-sweet chocolate chips.
06 - Divide the batter evenly among the muffin cups, filling each about 3/4 full.
07 - Sprinkle mini chocolate chips on top of each muffin, if desired.
08 - Bake for 18-22 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
09 - Let muffins cool in the tin for 5 minutes, then transfer to a wire rack to cool completely.