Peanut Butter Cup Brownies Makes 40 brownies ~1 box of your favorite brownie mix ~1/2 cup peanut butter chips ~1/2 cup semi-sweet chocolate chips ~3/4 cup creamy peanut butter * Preheat oven to 350 degrees. Spray or grease 40 mini-muffin cups. Prepare boxed brownie mix as directed. Spoon batter evenly into muffin cups (about 1 heaping teaspoon). Bake for 13-15 minutes or until top is set and a toothpick inserted into center comes out slightly wet.