Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish or line it with parchment paper.

In a medium bowl, whisk together flour, cocoa powder, baking powder, and salt.

In a large bowl, cream together softened butter, granulated sugar, and brown sugar until fluffy (about 3 minutes).

Add eggs one at a time, mixing in vanilla extract and red food coloring until well combined.

Gradually mix dry ingredients into the wet mixture until just combined; do not overmix.

Pour the batter into the prepared baking dish and spread evenly. Bake for 25-30 minutes or until a toothpick comes out clean.

Allow to cool slightly before cutting into squares and serving.