• 4 (170g – 226g) chicken breasts, boneless skinless, tenderloins removed and trimmed
• 1 cup flour
• Salt and pepper
• 1/4 cup vegetable oil
• 71g pancetta, cut into pieces 1 inch long and 1/8 inch wide
• 226g white mushrooms, trimmed and sliced thin
• 1 garlic clove, minced
• 1 teas tomato paste
• 1 1/2 cups sweet Marsala wine
• 4 1/2 teas lemon juice
• 4 tbs unsalted butter, cut into 4 pieces and chilled
• 2 tbs chopped fresh parsley
Adjust oven rack to middle position and heat oven to 200 degrees. Halve chicken horizontally, then cover chicken halves with plastic wrap and pound to an even 1/4 inch thickness with meat pounder. Place flour in a shallow dish or pie plate.
Pat chicken dry with paper towels and season with salt and pepper. Working with 1 cutlet at a time, dredge in four mixture, shaking off excess, and transfer to large plate.
Heat 2 tbs oil in a 12 inch non stick pan over medium-high heat until shimmering. Place 4 cutlets in non stick pan and cook until golden brown on first side, about 3 minutes. Flip cutlets, reduce heat to medium, and cook until no longer pink and lightly browned on second side, about 2 minutes longer; transfer to large oven safe plate. Wipe out non stick pan. Repeat with remaining 2 tbs oil and remaining cutlets. Tent loosely with aluminum foil and transfer to oven to keep warm while making sauce.
Cook pancetta in now-empty non stick pan over low heat, stirring occasionally and scraping up any browned bits, until crisp, about 5 minutes. Remove pancetta with slotted spoon and transfer to paper towel lined plate.
Add mushrooms to non stick pan, increase heat to medium-high and cook stirring occasionally, until softened and lightly browned, about 8 minutes. Stir in garlic and tomato paste, and crisp pancetta and cook until tomato paste begins to brown, about 1 minute. Off heat stir in Marsala, scraping any browned bits. Return to high heat, bring to a vigorous simmer, and cook stirring occasionally, until sauce is thickened and measures 1 1/4 cups, about 5 minutes. Off heat, stir in lemon juice and any accumulated chicken juices. Whisk in butter, 1 piece at a time. Stir in parsley and season with salt and pepper to taste. Pour sauce over chicken and serve immediately.