Ingredients:

• For the copycat smash sauce
• 1/4 cup mayonnaise
• 1 tablespoon Dijon mustard
• 2 teaspoons pickle juice
• 1 tablespoon diced pickle
• For the burger seasoning mix
• 1 tablespoon kosher salt
• 1 tablespoon black pepper
• 1 teaspoon seasoned salt
• For the smashburger
• 1 pound 80/20 ground chuck
• 4 potato hamburger buns
• 2 tablespoons butter, divided
• For the toppings
• 1/2 head green leaf lettuce, washed and dried
• 1 medium tomato, sliced
• 1/2 medium red onion, sliced
• 6 slices American cheese