Meat lovers! If using protein, top pasta while plating dish. Cook proteins in a large non-stick pan over medium-high heat, using 2 tsp. olive oil. If using Italian sausage, remove from casting. Add to hot pan and break up with a spoon until no pink remains, 4-6 minutes. If using chicken pat dry and cut into 1" dice. Season with a pinch of salt and pepper. Add to hot pan and stir occasionally until chicken reaches minimum internal temperature, 5-7 minutes. If using shrimp, pat dry and season with a pinch of salt and pepper. Add shrimp to hot pan and cook undisturbed until seared on one side, 2-3 minutes. Flip, and cook until shrimp reaches minimum internal temperature, 1-2 minutes.