Smothered Steak Burgers Recipe | Say Mmm

Ingredients

• Cooking spray
• 2 tablespoons finely chopped shallots
• 1 garlic clove, minced
• 1 (8 ounce) package presliced button mushrooms
• 1/2 cup fat-free, less-sodium beef broth
• 1 tablespoon low-sodium steak sauce (such as Angostura)
• 1 teaspoon cornstarch
• 1/2 teaspoon freshly ground black pepper, divided
• 2 tablespoons ketchup
• 1 tablespoon Worcestershire sauce
• 1 pound ground sirloin
• 1/4 teaspoon salt