- Portion size 4 servings
MethodStuffing: In skillet, melt butter over medium-low heat; fry leeks and salt, stirring often, until softened, about 8 minutes.
Add sherry; cook over medium-high heat just until evaporated, about 2 minutes. Scrape into bowl and let cool. Stir in Gorgonzola cheese.
With knife held horizontally and starting at curved side, cut chicken in half almost but not all the way through; open like book. Spread one-quarter of the stuffing evenly over 1 side of each breast, leaving 1/2-inch (1 cm) border uncovered. Sprinkle flour over each bottom border; close breast, pressing edge to seal. (Make-ahead: Cover and refrigerate for up to 24 hours; add 5 minutes to roasting time.)
Place chicken , skin side up, on foil-lined rimmed baking sheet. In small bowl, combine oil, thyme, salt and pepper; brush over chicken.
Roast in 400∞F (200∞C) oven for 15 to 20 minutes or until golden and no longer pink inside. Broil, watching carefully to avoid scorching, until skin is crisp and golden brown, about 2 minutes.