Preheat the oven to 350 degrees F, and line 2 baking sheets with parchment paper.
Whisk the flour, cocoa powder, baking soda, and salt. Set it aside.
In a large mixing bowl, combine the brown sugar and granulated sugar. Whisk in the melted butter until combined.
Add the egg, milk, vanilla extract, vinegar, and red food coloring. Mix well to combine.
Next, stir the dry ingredients into the wet ingredients until just combined.
Fold in 1 cup of the chocolate chips. Using a 2-tablespoon cookie scoop, spoon medium-sized mounds of dough onto the prepared baking sheet.
Just before baking, top with the remaining chocolate chips by slightly poking them into the batter.
Bake for 10 minutes (or until the cookies puff up and the dough is soft but not squishy when touched).
Transfer the cookies to a wire cooling rack and allow to cool down for 5 minutes before enjoying.
Notes
Use gel food coloring for the most vibrant color.
Top the cookies with half the chocolate chips instead of mixing them all into the dough so the melted chips will peek through the tops of the cookies.
Let the cookies cool for at least 5 minutes for the best texture.
Store leftover cookies in an airtight container on the counter for 3 days or in the refrigerator for up to a week.
To freeze, store them in a freezer-safe container for up to 3 months.
The cookie batter can also be frozen.
For a more rounded shape, chill the dough in the refrigerator for 1-2 hours before baking. Cold dough won’t spread as fast, so the cookies end up taller.
This nutrition information is based on the exact products I used in this recipe. Brands and sizes of products could alter exact nutrition and should always be calculated independently.