Prepare the brownies according to the directions on the back of the box. Typically it calls for oil, eggs, and water.
Pour half of the brownie batter into the pan and spread it in an even layer.
Place 20 Oreos onto the brownie batter (in even rows) and gently press them into the batter.
Spoon the remaining brownie batter over top the Oreos and spread it into an even layer.
Bake for 28-31 minutes. When down, allow the brownies to cool completely inside the pan.
Stir the orange gel food coloring into the vanilla frosting container and mix. Spread the frosting over top the cooled brownies.
Break the remaining Oreo cookies into larger chunks and sprinkle them over the frosting. Decorate the top of the brownies with sprinkles and gummy worms.