Combine ground beef, ½ cup Merlot & Mushroom Slow Cooker Sauce, bread crumbs and egg in a medium bowl. Form into 6 patties.
Place patties in a large skillet over medium-high heat. Cook 2-3 minutes; turn over and continue cooking 2-3 minutes. Remove from skillet and set aside.
Add oil to skillet. Add onions and mushrooms; sauté 3-4 minutes or until browned. Add remaining Merlot & Mushroom Slow Cooker Sauce and ½ cup water. Add patties and simmer 8-10 minutes.
Serve over mashed potatoes, if desired.