In a large saucepan, prepare Horizon macaroni and cheese according to box directions.
Meanwhile, in a large skillet, heat olive oil over medium-high heat. Add turkey, red onion, and red bell pepper. Saute, breaking up turkey, until turkey is cooked through and onions are translucent. Stir in black beans, taco seasoning, prepared macaroni and cheese, and shredded cheese until cheese is melted.