Stir-fries are a quick and easy way to enjoy a flavorful and nutritious meal. Heat a tablespoon of oil in a large skillet or wok over high heat. Add your choice of protein, such as sliced chicken, beef, or tofu, and cook until browned. Remove the protein from the skillet and set aside. In the same skillet, add sliced vegetables like bell peppers, broccoli, and carrots. Stir-fry for a few minutes until crisp-tender. Return the protein to the skillet and add a sauce of your choice, such as soy sauce or teriyaki sauce. Cook for another minute or until heated through. Serve over steamed rice or noodles.