Slow-Cooker Salisbury Steak Meatballs Recipe | Say Mmm

Ingredients

• 2 tablespoons butter, melted
• 1 tablespoon Muir Glen™ organic tomato paste
• 1/2 teaspoon salt
• 2 cups thinly sliced onions
• 8 oz mushrooms, thinly sliced (about 3 cups)
• 1 cup Progresso™ beef flavored broth (from 32-oz carton)
• 1 lb lean (at least 80%) ground beef
• 1/2 cup Progresso™ plain panko crispy bread crumbs
• 1/3 cup milk
• 1 egg, slightly beaten
• 1 tablespoon Montreal steak grill seasoning
• 1 tablespoon soy sauce
• 2 tablespoons cornstarch
• 2 tablespoons cold water
• 1 pouch (4.7 oz) Betty Crocker™ creamy butter mashed potatoes, made as directed on pouch
• 2 tablespoons chopped fresh Italian (flat-leaf) parsley leaves