Creating Slow Cooker Beef Stroganoff is straightforward. Follow these simple steps to achieve a delicious meal:

1. Prepare the Beef: In a large bowl, season the beef stew meat with salt and pepper.
2. Sear the Meat (Optional): For added flavor, sear the beef in a skillet over medium-high heat for 3-4 minutes on each side until browned. This step is optional but enhances the dish.
3. Add Ingredients to Slow Cooker: Place the beef in the slow cooker. Add the diced onion, minced garlic, and sliced mushrooms on top.
4. Mix the Sauce: In a separate bowl, combine the beef broth, Worcestershire sauce, Dijon mustard, and paprika. Pour this mixture over the beef and vegetables in the slow cooker.
5. Cook: Cover and cook on low for 6-8 hours or on high for 3-4 hours, until the beef is tender.
6. Thicken the Sauce (Optional): If you prefer a thicker sauce, mix cornstarch with a little water to create a slurry. Stir it into the slow cooker about 30 minutes before serving.
7. Add Sour Cream: Once the beef is tender, stir in the sour cream until fully incorporated.
8. Serve: Serve the beef stroganoff over cooked egg noodles or rice. Garnish with fresh parsley for a pop of color.

These steps will guide you in creating an incredible slow cooker beef stroganoff that your family will love.