Prepare onions and peppers by slicing into thin slices. Juice a large fresh lime.
In a large skillet over medium-high heat, add the peppers, onion, minced garlic, and olive oil. Stir until cooked, about 10 minutes. Remove the peppers and onions from the skillet and set aside.
In the same skillet add the sliced steak. Cook for 3-5 minutes or just until cooked through.
Next, add the peppers and onions back into the skillet along with the steak.
Add the beef broth to a small bowl or measuring cup. Add the cornstarch until combined to make a slurry. Pour into the skillet. Then add lime juice to the skillet.
Add the sugar, cumin, paprika, chili powder, salt, black pepper, and cilantro to the skillet and stir until steak, bell peppers, and onions are coated.
Stir until the sauce is thick.
Remove from the heat. Top with more cilantro (optional). Serve and enjoy.