In a medium-sized bowl, add the brownie filling ingredients. Mix well. Transfer to a zip-top gallon-sized bag and store in the fridge for at least 4 hours or overnight to firm up.
In another medium-sized bowl, add the chocolate chip cookie ingredients. Mix well. Transfer to a zip-top gallon-sized bag and store in the fridge for at least 4 hours or overnight to firm up.
Preheat the oven at 375F.
Line a baking sheet with parchment paper.
Scoop 1 tbsp (about 15 grams) of chocolate chip mix and flatten it.
Scoop 1 tsp (about 7 grams) of brownie mix and roll into a ball. Place it in the middle of the flattened chocolate chip.
Seal the brownie roll in the chocolate chip mix and roll into a bigger ball.
Place it on the parchment-lined baking sheet.
Repeat until you have about a dozen chocolate chip brownie cookies.
Return the remaining chocolate chip and brownie mixes to the fridge so they don't soften up.
Bake in the oven for 10 minutes.
Transfer cookies to a cooling rack to cool.
Bake a couple more batches until you've used up all the chocolate chip mix.
There will be some extra brownie mix left. Freeze it for later or bake a pan of brownies!