Ingredients

2 tablespoons extra-virgin olive oil, divided
1 tablespoon butter
2 large onions, very thinly sliced
Salt and freshly ground black pepper
1/3 cup pitted chopped black olives, nicoise or kalamata,
1 tablespoon anchovy paste
2 pounds ground chicken
1 tablespoon dried herbes de Provence
1 teaspoon fennel seed
2 teaspoons lemon zest
2 cloves garlic, minced or finely chopped
4 slices Swiss cheese
4 crusty rolls, split and lightly toasted
4 red or green lettuce leaves
Potato chips, for serving

Directions

1. Combine 1 tablespoon olive oil and butter in a skillet over medium heat. Add onions to the pan, season with salt and pepper and cook 20 minutes to caramelize then stir in olives and anchovy paste and cook 2 minutes more. Remove from stove.
2. While the onions cook, combine chicken with herbes de Provence, fennel seed, lemon zest, garlic, salt and pepper. Heat 1 tablespoon olive oil in a large nonstick skillet over medium-high heat. 3. Form 4 patties and cook 6 minutes on each side.
4. Melt the Swiss cheese on each burger the last 2 minutes of cook time.
5. Loosely tent the burgers under foil to melt the cheese.
6. Serve the burgers on buns topped with lettuce and caramelized onion topping.
7. Serve with potato chips alongside.