Cut the roast into 2-inch cubes, try to remove as much of the silver skin as you can. Place cubes in a large mixing bowl. Season with garlic salt and pepper and toss to distribute.
2.5 pounds sirloin tip roast, 2 teaspoons garlic salt, 1/2 teaspoon black pepper
Heat olive oil in skillet over medium-high heat until shimmering. Add beef in an even layer and cook for 2-3 minutes undisturbed to help create a nice sear. Cook on all sides.
2 Tablespoons olive oil
Remove meat from skillet and add to slow cooker. Add in onions, mushrooms, onion powder, Italian seasoning, garlic powder, minced garlic, and beef broth.
Cover and cook on low for 6-7 hours.We suggest checking the meat at the 6 hour mark. Cooking this dish for 8 hours can make the meat too tender and the cubes won’t hold their shape. Of course, if you prefer the meat to fall apart, cook it 7-8 hours!
To make a gravy, strain the juices from the crockpot and place in a saucepan. Heat over medium-high until bubbling.
To thicken the gravy, you can make a slurry by whisking the cornstarch into the water, then slowly whisking it into the saucepan. Allow to simmer over medium heat, stirring occasionally, until desired thickness.
Trimming the silver skin from the meat is essential. This is a tough, shiny, silvery-white membrane of connective tissue that should be removed before cooking. Silver skin remains chewy after cooking, it can also cause the meat to curl up, and it keeps your seasonings from penetrating, so it should be trimmed with a sharp knife. To remove it, slide knife between the silver skin and the meat, making a small cut to create a tab to hold. Then, hold the tab taut and run the knife blade under the membrane, pulling it away from the meat to remove it.
Beef stew meat can also be used for this dish.
You can also omit the mushrooms or use a different type if you have a favorite.