If desired, heat olive oil in a skillet over medium heat. Sear the sliced beef for 2-3 minutes until browned. Transfer the beef to the Crock Pot.
In the Crock Pot, add the sliced bell peppers, onion, and minced garlic on top of the beef.
In a mixing bowl, combine the beef broth, soy sauce, cornstarch, brown sugar, black pepper, salt, and paprika. Stir until well mixed.
Pour the sauce over the beef and vegetables in the Crock Pot, ensuring everything is evenly coated.
Cover and cook on low for 6 hours or on high for 3 hours until the beef is tender and the flavors are well combined.
Once finished cooking, stir the mixture before serving.
Serve the pepper steak over cooked rice or noodles to soak up the flavorful sauce.
For added heat, consider adding red pepper flakes or diced jalapeños to the Crock Pot.
If you want a thicker sauce, mix an additional teaspoon of cornstarch with water and stir into the mixture during the last 30 minutes of cooking.