Slow Cooker Salisbury Steaks - Easy Comfort Food Recipe - Zest Plate

Ingredients

• 1 cup Baby Portabello Mushrooms, sliced
• 1 Onion, thinly sliced
• 1 1/3 pounds Lean Ground Beef
• 1 tablespoon Steak Seasoning
• 3 tablespoons Worcestershire Sauce, divided
• 1 teaspoon Dried Onion Flakes
• 1 teaspoon Dried Parsley
• 1/2 cup Breadcrumbs (Plain or Italian)
• 1 Egg
• 3 tablespoons Cornstarch, divided
• 2 cups Beef Broth
• 1/8 teaspoon Black Pepper