Salisbury Steak Sandwich Stack | Publix Super Markets

Ingredients

• 6 (1/2-inch-thick) slices Bakery Italian Five-Grain Bread
• 1 medium yellow onion, chopped
• 1 1/2 teaspoons fresh thyme, chopped
• 8 oz whole baby portabellas, halved
• 1 1/2 lb lean ground beef, 7% fat
• 1/2 teaspoon kosher salt
• 1/4 cup + 1 tablespoon all purpose flour
• 3 tablespoons canola oil, divided
• 1 (9-oz) box frozen creamed spinach
• 1 1/2 cups reduced-sodium beef broth
• 3 tablespoons gourmet mayonnaise w/mustard, peppercorns
• 1 tablespoon water
• 1 (24-oz) container refrigerated mashed potatoes