French Onion Chicken

This French onion chicken pot pie is about to be your new favorite comfort dish.

300 Calories

30g Carbohydrates

30g Protein

687mg Potassium

2g Fiber

6g Sugar

6 (about 2 1/2 pounds total) bone-in, skin-on chicken thighs
2 tablespoons, plus 2 teaspoons olive oil, divided
2 teaspoons kosher salt, divided
1 teaspoon black pepper, divided
1 frozen puff pastry sheet, thawed (from 1 [17.3-ounce] package)
1 large egg, beaten
2 tablespoons unsalted butter
2 medium-size (about 1 pound, 4 ounces total) yellow onions, halved lengthwise and sliced 1/4-inch-thick (4 1/2 cups)
2 large (6 ounces total) carrots, peeled and cut into 1/2-inch cubes (1 cup)
¼ cup water
1 tablespoon minced garlic (from 3 garlic cloves)
¼ cup dry sherry
3 tablespoons all-purpose flour, plus more for work surface
2 cups beef stock
2 teaspoons chopped fresh thyme, plus more for garnish
¾ teaspoon chopped fresh rosemary
4 ounces shredded Gruyère cheese, shredded (1 cup)