4 boneless, skinless chicken breasts
1 cup unbleached all-purpose flour
ground black pepper
2 tablespoons olive oil
4 slices of bacon, chopped
2 cups white or cremini mushrooms
2 large garlic cloves, minced (about 1 tbsp.)
1 tbsp. minced shallot
1 tbsp. tomato paste
1 cup Marsala wine (sweet)
1/2 cup chicken stock
1 lemon, juiced
6 tbsp. unsalted butter
2 tbsp. chopped fresh parsley leaves
Adjust oven rack to lower-middle position, place large heatproof dinner plate on oven rack, and heat oven to 200 degrees. Meanwhile, pound the chicken breasts to a 1/2 inch thickness in between 2 pieces of plastic wrap. Pat chicken breasts dry. Place flour in shallow baking dish or pie plate. Season both sides of chicken cutlets with salt and pepper. Working one piece at a time, coat both sides of chicken breasts with flour. Shake to remove excess flour, and set aside.
Heat oil in 12-inch heavy-bottomed skillet over medium-high heat until very hot (you can hold your hand 2 inches above pan surface for 3 to 4 seconds), about 3 minutes. Place floured cutlets in single layer in skillet and cook until golden brown, about 4 minutes. Using tongs, flip cutlets and cook on second side until golden brown and meat feels firm when pressed with finger, about 4 minutes longer. Transfer chicken to heated plate and return plate to oven to keep warm.
Return skillet to low heat and add bacon; saute, stirring occasionally and scraping pan bottom to loosen browned bits until bacon is brown and crisp, about 4 minutes. With slotted spoon, transfer bacon to paper towel–lined plate.
Add mushrooms and increase heat to medium-high; saute, stirring occasionally and scraping pan bottom, until liquid released by mushrooms evaporates and mushrooms begin to brown, about 8 minutes. Add garlic and shallot and saute for 1 minute. Add tomato paste, and cook until paste begins to brown, about 1 minute.
Add Marsala and chicken stock, and increase heat to high. Scrape browned bits from pan bottom, and bring to boil. Reduce heat to medium, and simmer until sauce is slightly syrupy and reduced to about 1 1/4 cups, about 5 minutes.
Off heat, add lemon juice and any accumulated juices from chicken in the oven; whisk in butter 1 tablespoon at a time. Season to taste with salt and pepper, and stir in parsley. Return chicken breasts to pan and simmer in sauce for a few minutes before serving.