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Whisk the cream of mushroom soup, beef broth, sour cream, Worcestershire sauce, Dijon mustard, garlic powder, salt, and pepper in a mixing bowl until smooth.
Pour the sauce over the meatballs.
Cover and cook on low for 3-4 hours until the meatballs are heated through and the sauce is creamy.
Mix the cornstarch with water to create a slurry. Stir the slurry into the slow cooker during the last 30 minutes of cooking. This will help to thicken the sauce.
Once the sauce has thickened, stir well and garnish with parsley before serving.