Prepare the ingredients by slicing the steak and vegetables.
Layer the sliced steak, onions, and bell peppers in the crock pot.
In a separate bowl, whisk together the garlic, beef broth, soy sauce, Worcestershire sauce, black pepper, and salt.
Pour the sauce mixture evenly over the beef and vegetables.
Cover the crock pot and cook on low for 6 to 8 hours or high for 3 to 4 hours.
()Assess the doneness of the beef before serving. If desired, thicken the sauce with cornstarch.
Season to taste before serving and adjust salt and pepper if needed.
Serve hot over rice or noodles, if desired, garnishing with sliced green onions.