| Level: | Easy |
| Total: | 40 min |
| Prep: | 10 min |
| Cook: | 30 min |
| Yield: | 4 servings |
Ingredients
- 2 tablespoons extra-virgin olive oil
- 1 large onion, halved and thinly sliced
- 1/2 teaspoon sugar
- Kosher salt
- 1/2 cup low-sodium chicken broth
- 2 tablespoons plus 1 teaspoon Worcestershire sauce
- 1 1/2 pounds ground beef
- 1 teaspoon onion powder
- 4 brioche or hamburger buns, split
- 2 cups shredded gruyere cheese (about 6 ounces)
- 2 tablespoons grated parmesan cheese
- Dijon mustard, lettuce and potato chips, for serving (optional)
Instructions
- Heat the olive oil in a large skillet over medium-high heat. Add the onion and cook, stirring, until it starts to brown, 3 to 4 minutes. Add the sugar and 1/2 teaspoon salt, reduce the heat to medium low and cook, stirring occasionally, until deep golden, 15 more minutes. Add the chicken broth and 1 teaspoon Worcestershire sauce and simmer until the onion is tender and the liquid is almost evaporated, 8 minutes.
- Preheat the broiler. Mix the beef, onion powder and the remaining 2 tablespoons Worcestershire sauce in a bowl with your hands. Form into four 3/4-inch-thick patties and place on a broiler pan. Make an indentation in the center of each with your thumb; season the patties with salt. Broil, turning once, 5 minutes.
- Place the buns cut-side up on a baking sheet. Sprinkle with both cheeses and broil until melted, about 1 minute. Spread mustard on the buns; sandwich with lettuce, the burgers and caramelized onion. Serve with potato chips.
Nutrition Facts
| Calories | 705 |
| Total Fat | 43 grams |
| Saturated Fat | 17 grams |
| Cholesterol | 160 milligrams |
| Sodium | 986 milligrams |
| Carbohydrates | 28 grams |
| Dietary Fiber | 2 grams |
| Protein | 49 grams |
Reviews
Made this for Super Bowl Sunday and they were a huge hit!