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1. Place the beef, onion, garlic, mushrooms, beef broth, Worcestershire sauce, paprika, Dijon mustard, salt, and pepper in a slow cooker. Stir to combine.
2. Cover and cook on low for 7–8 hours or on high for 4–5 hours, until the beef is tender.
3. In the last 30 minutes of cooking, stir in the cornstarch slurry to thicken the sauce.
4. Before serving, stir in the sour cream and adjust seasoning with additional salt and pepper if needed.
5. Serve the stroganoff over cooked egg noodles and garnish with fresh parsley.
**Prep Time:** 15 minutes | **Cooking Time:** 7–8 hours (low) or 4–5 hours (high) | **Total Time:** 8 hours
**Kcal:** 450 kcal | **Servings:** 6 servings
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