To get started, heat 2 tablespoons of cooking oil in a large skillet over medium-high heat. Once hot, add the beef sirloin strips. Sprinkle with garlic powder, salt, and black pepper. Sear the beef until browned on all sides, about 5 to 7 minutes. This step is crucial as it locks in the juices and flavors.
Once the beef is nicely browned, transfer it to the bottom of your slow cooker. This will form the base of your delicious dish.
Next, slice the green and red peppers into long strips and chop or slice the onion. Add these colorful vegetables on top of the seared beef in the slow cooker. They will cook down beautifully and contribute to the flavor.
Open the can of diced tomatoes (do not drain) and pour it over the veggies and beef. This will provide moisture and a rich flavor to the overall dish.
In a small bowl, combine 1/4 cup of hot water and 1 cube of beef bouillon. Stir until the bouillon dissolves completely. This mixture will serve as a flavorful broth for your dish.
Pour this bouillon mixture into the slow cooker, covering the beef and vegetables. It will create a delicious base for the sauce.
To thicken the gravy, stir 1 tablespoon of cornstarch into the hot beef broth until it's well combined. Then, add this mixture into the slow cooker along with 3 tablespoons of soy sauce and 1 teaspoon of sugar. Mix all ingredients well.
Place the lid on the slow cooker and set it to cook on low for 6 to 8 hours or high for 3 to 4 hours. The longer it cooks, the more tender the beef becomes.
When it’s ready, give your Slow Cooker Peppered Steak a good stir, mixing all the flavors together. Serve it over steamed white rice or egg noodles for a complete meal that everyone will love.
