Preheat oven to 350°. Spray 12-cup muffin pan with no-stick spray; set aside.
Prepare brownie mix according to package directions; pour into prepared muffin pan, filling cups about half full.
Bake 15 to 18 minutes until firm. Cool in pan on wire rack 5 minutes, then remove from pans and cool completely.
To make brownie cups, scoop out some of the center of brownies with a spoon. Scoop Breyers® Extra Creamy Vanilla into brownie cups, then drizzle with Breyers™ Hot Fudge Ice Cream Sauce and Breyers™ Caramel Flavored Ice Cream Sauce and top with Breyers™ Rainbow Sprinkles. Serve immediately.