Preheat the oven to 350 F. Line a 12 cup muffin pan with paper liners. In a large bowl, whisk together flour, sugar, cocoa powder, salt, and baking soda. Add in melted butter, eggs, and vanilla extract. Mix until smooth.
In a medium bowl, whisk together flour, salt, and baking soda. In a large bowl, combine butter with sugar until fluffy. Add in egg and vanilla extract, and mix until smooth. Add in the flour mixture, mix until it is fully combined.
Divide the cookie dough into two bowls. Color one half blue with the blue food coloring, and the other half green with the green food coloring.
Evenly divide the brownie batter between the prepared liners. Take a piece of both colors of cookie dough, and roll into a ball. Place over the brownie batter. Bake for 20-25 minutes.
