01 -
Pat beef pieces dry with paper towels and season with salt and black pepper, ensuring all sides are coated.
02 -
Heat olive oil in a large skillet over medium-high heat. Working in batches, quickly brown beef on all sides for added flavor. Skip this step if short on time.
03 -
In a bowl, whisk together beef broth, soy sauce, Worcestershire sauce, brown sugar, tomato paste, minced garlic, smoked paprika, onion powder, and red pepper flakes until mixture is homogenous.
04 -
Place browned beef into the slow cooker. Arrange potatoes, carrots, mushrooms, and onion around and on top of the meat if using. Pour sauce mixture evenly over all ingredients.
05 -
Cover and cook on low for 6 to 8 hours or on high for 3 to 4 hours, until beef is fork-tender.
06 -
Twenty minutes before serving, combine cornstarch with cold water to form a slurry. Stir into slow cooker, cover, and cook on high for 15 to 20 minutes until sauce is thickened.
07 -
Spoon beef and sauce over mashed potatoes, rice, or egg noodles as desired. Garnish with fresh parsley if preferred and serve hot.