1. Brown the Steak
In a skillet over medium-high heat, warm the olive oil. Add the steak strips and minced garlic, cooking until the beef is browned on all sides.
2. Make the Sauce Thickener
Dissolve the bouillon cube in hot water, then whisk in the cornstarch until smooth. Pour this mixture into the crockpot.
3. Add Flavorings
Stir in the soy sauce, brown sugar, Worcestershire sauce, diced tomatoes, and a pinch of pepper.
4. Combine and Cook (Phase 1)
Add the chopped onions and browned steak to the crockpot, mixing well. Cook on HIGH for 3 hours or LOW for 6–7 hours.
5. Add Peppers and Finish (Phase 2)
Stir in the sliced bell peppers and continue cooking for 1 more hour on the same setting. Serve hot and enjoy!