Preheat oven to 350°F
In separate bowls, mix cookie wet ingredients and dry ingredients, then add mix-ins and combine
In separate bowls, mix brownie wet ingredients and dry ingredients, then add mix-ins if using and combine without overmixing
Pour brownie batter into a sprayed loaf tin
Add cookie batter in dollops on top
Sprinkle toppings on top
Bake 50-55 minutes, slightly underbaked for ooey and gooey texture
Let cool, slice, and enjoy
