Prep: Preheat oven to 375°F. Prepare three dredging stations: flour (seasoned), egg mixture (whisked with lemon juice), and the Pecorino-panko-zest blend.
Coat: Pat chicken dry. Dredge each breast in flour, dip in egg, and press firmly into the cheese-crumb mixture until well-coated.
Sear: Heat olive oil in a skillet over medium-high heat. Sear chicken for 2–3 minutes per side until golden.
Bake: Transfer to a parchment-lined baking sheet and bake for 20–25 minutes (internal temperature of 165°F).
Sauce: While chicken bakes, whisk cream and mustard in a small saucepan over medium-low heat. Stir in lemon juice, garlic, and broth; cook gently for 3–5 minutes.
Serve: Let chicken rest for 3–4 minutes, then drizzle with sauce and garnish with parsley.