Jalapeño-Cheddar Pork Burger - Double Double

In a skillet over high heat, add the onions and olive oil; cook, stirring, until the onions are well caramelized.

Season with salt, pepper, and thyme; add the balsamic vinegar and cook, stirring for two minutes. Set aside.

Cook the burgers in the oven on a baking sheet at 375°F (190°C) for 14–15 minutes, or on a griddle, flipping frequently. Cook until an internal temperature of 165°F (75°C) is reached. Keep warm.

Brush the inside of the bun with butter and toast it well on a grill.

Spread mayonnaise on both toasted sides of the bun.

Add the onion confit, burgers, bacon, and cheddar slices. Serve immediately.