Preheat oven to 350°F. Grease two 9-inch round cake pans or a 13x9-inch pan.
Prepare brownies according to package directions, and pour into 13x9 pan or evenly divided between the two 9-inch round pans.
In a large bowl, mix together the sweetened condensed milk, coconut, butterscotch chips, and chocolate chips. Drop in spoonfuls onto the brownie mix and spread out as much as possible to cover brownie mix.
Consult the baking instructions on your box of brownies. In general, bake for 35-45 minutes, or until a toothpick inserted comes out clean.
Notes
Nutritional information is only an estimate and does not include the oil and eggs used to make the brownie mix, as the amount of each varies per brand.Source: Inspired by Eagle's Magic Cookie Bar recipeYou're Gonna Bake It After Allbakeitafterall.com