This decadent, company-worthy casserole, features tender chicken thighs and melted turnips and leeks bathed in a creamy gratin sauce reminiscent of fondue and topped with garlicky breadcrumbs. Sherry and Cognac join forces to cut through the richness of the gratin while adding a touch of nuttiness.
Allow the flavorful browned bits to build in the skillet as the chicken sears — these golden nuggets are key to building the foundation of the cheese-laden sauce. (If necessary, brown the chicken pieces in two batches so that they brown instead of steam.)

For a more funky and pungent flavor, try Gruyère cheese. For a more mild, buttery, and nutty flavor, opt for aged Gouda. The topping of breadcrumbs helps to provide a pleasantly crunchy contrast to the soft, creamy chicken gratin. Tossing the breadcrumbs with olive oil, garlic, salt, and pepper before baking infuses them with extra flavor.
A few things we did differently was incorporate 3 leeks instead of two, use a bit more cheese, and mixed in the cheese with the breadcrumb mixture (that was actually a mistake, but we liked the result!).
We served ours with a Herbed Barley Pilaf. But upon consideration, it was a rather heavy side dish for the gratin, so a green vegetable or side salad might be a better match.

Chicken Gratin
Ingredients
- 8 small boneless, skinless chicken thighs (about 2 1/4 lbs.)
- 1 3/4 tsp. kosher salt, plus more to taste
- 1 1/4 tsp. black pepper, divided
- 5 Tbsp. unsalted butter, divided
- 2 medium (about 12-oz.) leeks, thoroughly washed, light green and white parts of leeks cut in half lengthwise, and sliced diagonally into 1 1/2-inch pieces
- 5 garlic cloves, 4 finely chopped and 1 grated
- 1 1/4 pounds turnips (about 3 medium turnips), peeled and cut into 1/2-inch pieces
- 2 Tbsp. all-purpose flour
- 1 cup chicken stock
- 3 Tbsp. (1 1/2 oz.) Cognac
- 2 Tbsp. (1 oz.) dry sherry
- 3/4 cup heavy cream
- 1 Tbsp. Dijon mustard
- 1 1/2 tsp. finely chopped fresh thyme, plus thyme sprigs for garnish
- 1/2 tsp. ground nutmeg
- 5 oz. Gruyère or aged Gouda cheese, grated (about 1 1/4 cups)
- 3 Tbsp. olive oil
- 1 1/2 cups fresh breadcrumbs (from 1 small French bread loaf)

















Directions
- Pat chicken dry with paper towels. Sprinkle evenly with 1 teaspoon salt and 1/2 teaspoon pepper. Heat 3 tablespoons butter in a large skillet over medium until foamy. Working in batches, if needed, cook chicken, undisturbed, until well browned, about 10 minutes, adjusting heat as needed to prevent browned bits in skillet from burning. Flip chicken; cook until no longer pink on the outside, about 1 minute. (You may to do this in two batches.) Transfer chicken to a plate, and set aside. Remove skillet from heat; do not wipe clean. Preheat oven to 375°F.
- Increase heat to medium-high under skillet. Add turnips, and sprinkle with 1/4 teaspoon salt and 1/4 teaspoon pepper. Cook, stirring occasionally, until turnip edges are browned, 4 to 5 minutes. Transfer turnips to a large (2 1/2- to 3-quart) baking dish; set aside. Reduce heat to medium.
- Add leeks to the skillet and sprinkle with 1/4 teaspoon salt and 1/4 teaspoon pepper. Cook over medium, stirring often, until softened, about 3 minutes. Transfer the leeks to the baking dish with turnips. Do not wipe the skillet clean.
- Add remaining 2 tablespoons butter to skillet and melt over medium. Add finely chopped garlic; cook, stirring constantly, until fragrant, about 30 seconds. Add flour; cook, stirring constantly, 1 minute. Stir in chicken stock, Cognac, and sherry. Bring to a simmer over medium, and stir using a wooden spoon to scrape up browned bits from the bottom of the skillet. Stir in cream, mustard, chopped thyme, and nutmeg; simmer over medium, stirring occasionally, until sauce is slightly thickened, 2 to 3 minutes. Remove from heat. Season with additional salt to taste.
- Arrange chicken thighs over turnip-and-leek mixture in the baking dish. Pour sauce evenly over the mixture; sprinkle with cheese.
- Place the grated garlic clove in a medium bowl. Stir in oil. Add breadcrumbs, remaining 1/4 teaspoon salt, and remaining 1/4 teaspoon pepper; toss to combine. Sprinkle evenly over chicken mixture.
- Bake in preheated oven, uncovered, until breadcrumbs turn dark amber brown, sauce bubbles in the center, and a thermometer inserted in the thickest portion of chicken registers at least 165°F, 30 to 40 minutes. Remove from oven, and let cool 5 minutes. Garnish with thyme sprigs, and serve.
Adapted from a recipe by Amy Thielen for Food & Wine























































