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 eggs, melted butter, and vanilla extract and 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 the egg and mint extract and mix until it is smooth.
Add in the flour mixture, and mix until it is fully combined. Add in the green food coloring, and mix until it is fully green. Fold in the crushed Oreo cookies and chocolate chips.
Evenly divide the brownie batter into the muffin cups. Divide the cookie dough over the brownie batter. Bake for 20-25 minutes.
