• Sprinkle strips of sirloin with 2 to 3 teaspoons garlic powder, or to taste.
  2 to 3 teaspoons Garlic powder, 2 pounds beef sirloin

Slow Cooker:

• In a large skillet over medium heat, heat the vegetable oil and brown the seasoned beef strips. Transfer to slow cooker.
  3 tablespoons vegetable oil, 2 pounds beef sirloin
• Mix beef broth with cornstarch until dissolved. Pour into slow cooker with meat. Stir in onion, green peppers, stewed tomatoes, soy sauce, sugar, and salt.
  ½ cup beef broth, 1 tablespoon cornstarch, ½ cup chopped onion, 2 large green bell peppers, 1 14.5 ounce can stewed tomatoes, with liquid, 3 tablespoons soy sauce, 1 teaspoon white sugar, 1 teaspoon salt
• Cover and cook on High for 3 to 4 hours, or on Low for 6 to 8 hours.
• Thicken as desired with additional cornstarch/water solution. Suggested: start with 2 tablespoons cornstarch dissolved in 4 tablespoons water. Repeat as needed until desired consistency is reached. Mixture must be hot for cornstarch to thicken the sauce.

Instant Pot:

• Turn Instant Pot setting to sauté. Add oil and seasoned beef and cook until browned. Turn off the sauté function.
  2 pounds beef sirloin, 3 tablespoons vegetable oil, 2 to 3 teaspoons Garlic powder
• Mix beef broth with cornstarch until dissolved. Pour into the Instant Pot with meat. Stir in onion, green peppers, stewed tomatoes, soy sauce, sugar, and salt.
  ½ cup beef broth, 1 tablespoon cornstarch, ½ cup chopped onion, 2 large green bell peppers, 1 14.5 ounce can stewed tomatoes, with liquid, 3 tablespoons soy sauce, 1 teaspoon white sugar, 1 teaspoon salt
• Cover, seal, and set to meat/stew cooking cycle (18 minutes). When cooking cycle is complete, allow IP to vent naturally for at least 20 minutes before removing the lid.
• Thicken as desired with additional cornstarch/water solution. Suggested: start with 2 tablespoons cornstarch dissolved in ¼ cup water. Repeat as needed until desired consistency is reached. Mixture must be hot for cornstarch to thicken the sauce.