Season 2 pounds sirloin steak (cut into 1 1/2-inch cubes) with 1 teaspoon salt, ½ teaspoon black pepper, ½ teaspoon garlic powder, and ½ teaspoon onion powder.
Heat 2 tablespoons olive oil in a large skillet over medium-high heat. Add the seasoned steak cubes and cook until browned on all sides, about 5–7 minutes. Transfer the browned steak to the crockpot.
In the same skillet, add 1 large diced onion and cook until softened, about 3–4 minutes. Add 3 cloves minced garlic and cook for an additional 30 seconds, until fragrant. Transfer the onion and garlic to the crockpot.
Pour 1 cup beef broth and 1 tablespoon Worcestershire sauce into the crockpot. Add 1 teaspoon dried thyme and stir to combine.
Arrange 1 ½ pounds baby potatoes (halved) around the steak in the crockpot.
Cover the crockpot and cook on low for 6-8 hours, until the steak is tender and the potatoes are cooked through.
Garnish with chopped fresh parsley, if desired.
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Notes
If you prefer a thicker gravy, you can remove the steak and potatoes from the crockpot once they're done cooking, and then whisk together 2 tablespoons of cornstarch with 2 tablespoons of cold water. Stir this mixture into the crockpot and cook on high for an additional 15-20 minutes, or until the gravy has thickened.If you prefer, you can cook on HIGH for 3-4 hours, but the meat won’t be as tender.Refrigerate any leftovers in an airtight container for up to 5-6 days.