Beholder Burger | Mama's Cooking

Ingredients

• ***For the spice blend:***
• kosher salt, to taste
• 1 tablespoon Old Bay® seasoning
• 1 tablespoon paprika
• 1 tablespoon chili powder
• 1 tablespoon garlic salt
• ***For the sauce:***
• 1 cup mayonnaise
• 1 cup ketchup
• 1/2 teaspoon yellow mustard
• 1 canned chipotle chile in adobo sauce, finely chopped
• ***For the onion-mushroom topping:***
• 2 tablespoons extra-virgin olive oil
• 15 white button mushrooms, thinly sliced
• 1 small onion, thinly sliced
• freshly ground black pepper, to taste
• ***For the burgers:***
• vegetable oil, to taste, for greasing the grill grates
• 2 pounds ground beef chuck
• 4 slices Swiss cheese
• 4 sweet Hawaiian hamburger buns, split