Wisconsin Butter Burgers Recipe: How to Make It

Ingredients

• 1 pound lean ground beef (90% lean)
• 1/2 teaspoon seasoned salt
• 1/2 teaspoon pepper
• 1/2 pound fresh mushrooms
• 2 tablespoons plus 4 teaspoons butter, divided
• 4 hamburger buns, split
• Optional toppings: Tomato slices, lettuce leaves, dill pickle slices, ketchup and mustard