Meat lovers! If using protein, cook before making lasagna skillet. If using whole chicken breasts, pat chicken dry and, on a separate cutting board, cut into 1" dice. Season with 1/4 tsp. salt. If using diced chicken breasts, pat dry and season with 1/4 tsp. salt. If using chicken, place a large non-stick pan over medium-high heat and add 2 tsp. olive oil. Add diced chicken to hot pan and stir occasionally until chicken browns and reaches a minimum internal temperature of 165 degrees, 5-7 minutes. If using ground turkey, follow same instructions and add turkey and 1/4 tsp. salt to hot pan. Cook, breaking up with a spoon, until no pink remains, 7-9 minutes. Add protein with marinara sauce and noodles in Step 4.