Preheat oven to 350°F (175°C) and line an 8×8 inch baking pan with parchment paper.

In a bowl, whisk together flour, cocoa powder, baking soda, and salt; set aside.

In another bowl, beat softened butter with granulated and brown sugars until fluffy.

Add the egg and vanilla extract; mix in red food coloring until well combined.

Gradually add dry ingredients to wet mixture; stir until just combined.

Pour batter into the prepared pan; smooth evenly and bake for about 25-30 minutes or until a toothpick comes out clean.

Allow to cool before adding cream cheese frosting if desired.