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Combine the sauce ingredients in a large measuring cup with a spout and set aside. Measure out remaining ingredients before beginning.
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Slice the chicken in half lengthwise to create 2-3 thinner slices. Cover with saran wrap and use the textured side of a meat mallet to pound it to ½ inch thick.
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Season each side of the chicken with salt, pepper, and parsley.
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Heat olive oil in a large skillet over medium-high heat. Sear the chicken in batches for 4-5 minutes per side, until a golden crust has developed. Set aside.
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Turn the heat off. Add the wine and then set the heat to medium. Use a silicone spatula to clean the bottom and sides of the skillet, the “fond” will add more flavor to the sauce. Bring to a gentle bubble and reduce for 2 minutes. Add the garlic and cook for 2-3 more minutes, until the liquid has reduced by half.
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Add the butter and flour and stir to combine. Cook for 1-2 minutes to cook off the raw flour taste.
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Add the sauce mixture (from step 1) in small splashes, stirring continuously. Bring to a boil, then reduce to a simmer. Simmer and reduce for about 8 minutes.
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Reduce heat to low and gradually sprinkle in the Parmesan cheese, stirring continuously. Stir in the lemon juice.
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Add the chicken back and spoon the sauce on top. Heat through for 5 minutes or until the sauce has reached your desired thickness. Garnish with parsley and serve with mashed potatoes and roasted vegetables of choice!