Crockpot Salsa Chicken. Place whole chicken breasts in your crockpot and pour the salsa over it. Cook anywhere from 1½ to 2 hours on high. Take a baking dishand carefully place the chicken in the dish. Spoon some of the leftover salsa (from the crockpot) over the chicken and sprinkle evenly with the cheese. Bake for 15 minutes or until it's nice and golden brown, and you'll see the sauce and cheese bubbling.