Ingredients:

2 pounds top sirloin steak
1 red bell pepper, large dice
1 green bell pepper, large dice
1 onion, large dice
1 1/2 cups beef broth, divided
3 tablespoons soy sauce
1 tablespoon cornstarch
2 teaspoons brown sugar
1 teaspoon ground ginger
1 teaspoon garlic powder
1 teaspoon freshly ground black pepper

PREPARATION: 

Coat the steak generously with black pepper, giving it a gentle massage. Dice the steak into cubes or slice into strips, whichever you fancy, and nestle it in a 6-quart slow cooker with the vibrant onions and bell peppers.
In a separate bowl, whisk together 1 cup beef broth, soy sauce, brown sugar, ginger, and garlic powder. Drizzle this concoction over the steak ensemble in the slow cooker.
Blend the remaining 1/2 cup beef broth with the cornstarch and introduce it to the slow cooker. Give everything a hearty mix to ensure a harmonious blend.
Secure the lid on the slow cooker and embark on a 5-hour culinary journey on low. As the final note, give it a taste test and adjust the seasonings, if you wish.
Enjoy !