Ultimate Cheeseburger with Bacon, Caramelized Onions, Hash Browns & Special Sauce

Name: Ultimate Cheeseburger with Bacon, Caramelized Onions, Hash Browns & Special Sauce
Cook time: 1 h
Total time: 1 h
Yield: 6 servings
Ingredients: 6 brioche bun or roll; 2 lbs Wagyu ground beef; 12 slices bacon; 6 hash brown patty, frozen; 1/2 head butter (Boston) lettuce; 1 tomato; 3 medium yellow onion; 6 slices pepper jack cheese, sliced; 6 slices American cheese; 3 tbsp butter, unsalted; 1/2 cup mayonnaise; 2 tbsp ketchup; 1 tbsp white wine vinegar; 1 tbsp Worcestershire sauce; 1 tsp yellow mustard; 1 tsp chili-garlic sauce; 1 tsp granulated sugar; 2 tsp salt; 1/2 tsp crushed red pepper; 1/2 tsp garlic powder; 1/2 tsp onion powder; 1/4 tsp black pepper