Place sliced beef, bell peppers, and onion into the crock pot.
Add soy sauce, Worcestershire sauce, garlic powder, ground ginger, black pepper, diced tomatoes, and beef consommé.
Cover and cook on low for 6 to 7 hours or on high for 3 to 4 hours, until beef is tender.
In a small bowl, mix cornstarch with water to create a slurry.
Add the slurry to the crock pot and stir well.
Cover and cook on high for an additional 30 minutes, until the sauce thickens.
Serve hot over cooked rice.