Feel free to add all kinds of goodies to your homemade brownies! If you like, swap chocolate chips (or go 1/2 and 1/2 with) with peanut butter, mint, dark chocolate, milk chocolate, or white chocolate chips. You can also include other add-ins such as chopped tree nuts - like walnuts, almonds, or pecans, pretzels, mini marshmallows, dried cherries, mini peanut butter cups, M&Ms, or other small candies.