The French Onion Soup Burger With Caramelized Onions

Ingredients (15)

• 1 tablespoon olive oil
• 1 small onion, thinly sliced
• 2 pinches salt
• 1 pinch red pepper flakes
• 1 tablespoon unsalted butter
• 1/3 pound grass-fed ground beef
• 1/8 teaspoon salt
• Freshly ground black pepper, to taste
• 1/8 teaspoon garlic powder
• 1/8 teaspoon onion powder
• 1/8 teaspoon sugar
• 3 dashes Worcestershire sauce
• 1 thick slice Comté cheese
• 1 roasted garlic ciabatta bun
• 2 thick slices Gruyere cheese