Mushroom Swiss Burger

Ingredients (10)

• + 1 pound ground beef add to pantry
• + ½ sweet onion, chopped add to pantry
• + 1 (4 ounce) package chopped fresh mushrooms add to pantry
• ✓ 3 cloves garlic, minced
• + 1 egg white add to pantry
• ✓ 1 teaspoon seasoned salt
• + salt and ground black pepper to taste add to pantry
• + salt and ground black pepper to taste add to pantry
• + 6 slices Swiss cheese add to pantry
• + 6 hamburger buns add to pantry