Working with one piece at a time, place chicken cutlets between two sheets of plastic wrap. Using a meat mallet or the bottom of a small heavy skillet, pound out chicken so they are even thickness, about ¼” inch thick. Season all over with salt and pepper.

Set up dredging station: Beat eggs, garlic powder and a pinch of kosher salt in a pie plate or other shallow baking dish. Place flour in a second shallow dish.

Fill a large, heavy bottomed skillet with oil and place over medium-high heat. Working in two batches, coat each cutlet in flour, shaking off excess then dip in egg, turning to coat. Place the cutlets directly into the oil, being careful not to overcrowd the skillet.

Cook cutlets, flipping halfway through, until golden brown, 5 to 7 minutes. Transfer cutlets to a paper towel-lined plate to drain and season with salt and pepper. Repeat with remaining cutlets. Set aside.

Wipe out the pan of any excess oil and browned bits, then place back over medium heat. Toss 4 tablespoons of butter in the remaining flour and add to the pan. Melt butter, stirring until just beginning to foam then whisk in the wine. Raise the heat to medium high. Bring the wine to a boil and cook 1 minute.

Add stock, lemon juice and zest to the sauce and return to to a boil. Reduce heat to medium and cook, whisking constantly until sauce is reduced by about ⅓, 3 to 4 minutes. Once reduced, lower the heat to medium-low and swirl in the final tablespoon of butter until glossy.

Return the finished cutlets to the sauce and cook, flipping once, until heated through, 2 to 3 minutes. To serve, garnish with lemon slices and parsley.