→ Meats
01 - 1 pound ground beef (80/20 blend preferred)
→ Vegetables
02 - 1 medium yellow onion, finely diced
03 - 1 green bell pepper, finely diced
04 - 1 small red bell pepper, finely diced
05 - 2 cloves garlic, minced
→ Sauces & Liquids
06 - 2 tablespoons ketchup
07 - 1 tablespoon Worcestershire sauce
08 - 1 cup beef broth
09 - 2 teaspoons yellow mustard
→ Spices & Seasonings
10 - 1 teaspoon smoked paprika
11 - ½ teaspoon sea salt, plus more to taste
12 - ½ teaspoon black pepper
13 - ¼ teaspoon chili flakes (optional)
→ Cheese
14 - 1½ cups shredded provolone cheese
15 - ½ cup shredded mozzarella cheese
→ Bread
16 - 4 brioche burger buns, split and lightly toasted
17 - 2 tablespoons unsalted butter, for toasting buns