French Onion Burgers
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)
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