Creating Slow Cooker Pepper Steak is straightforward when you follow these simple steps:

1. Prepare the Beef: Slice the flank steak into thin strips against the grain.
2. Sear the Meat: In a skillet over medium heat, add the vegetable oil. Sear the beef strips for about 2-3 minutes until browned. This step is optional but enhances the flavor.
3. Layer Ingredients: In the slow cooker, place the seared beef at the bottom. Top with sliced onions and bell peppers.
4. Mix Sauce: In a separate bowl, whisk together the beef broth, soy sauce, cornstarch, brown sugar, Worcestershire sauce, garlic, ground ginger, salt, and pepper until well combined.
5. Combine: Pour the sauce mixture over the beef and vegetables in the slow cooker.
6. Cook: Cover and cook on low for 6-8 hours or on high for 3-4 hours, until the beef is tender and the vegetables are cooked through.
7. Thicken Sauce (Optional): If you prefer a thicker sauce, remove the lid during the last 30 minutes of cooking to let it reduce.
8. Serve: Once cooked, stir the mixture gently and adjust seasoning if necessary.

These steps will guide you in making an incredible Slow Cooker Pepper Steak effortlessly.