Salisbury Stacked Mashed Potatoes | Schnucks

Ingredients

• 1/4 cup panko breadcrumbs
• 1 egg
• 1 tbsp. Schnucks ketchup
• 1 1/2 tsp. Dijon mustard
• 1 1/2 tsp. McCormick's Montreal steak seasoning
• 1 tbsp. Schnucks pure olive oil
• 4 tbsp. unsalted butter, divided
• 1 small yellow onion, minced
• 1 cup sliced baby bella mushrooms
• 1 tbsp. all-purpose flour
• 1/2 cup low-sodium beef broth
• 1 1/2 tsp. Worcestershire sauce
• 1/2 lb. gold potatoes, quartered
• 1/2 cup milk
• 1 tbsp. chopped fresh parsley, divided
• 1/2 tsp. garlic powder
• 3 Schnucks fresh ground chuck patties