Slice each chicken breast horizontally to create thinner cutlets. Pat dry and season both sides with salt, pepper, garlic powder, and Italian seasoning.
Dredge each piece in flour, dip in beaten eggs, then coat with a mixture of breadcrumbs and grated Parmesan. Press firmly to ensure the coating sticks.
In a large skillet, heat olive oil over medium heat. Fry the chicken until golden brown and cooked through, about 4–5 minutes per side. Transfer to a plate and keep warm.
In the same pan, melt butter and sauté the garlic until fragrant. Sprinkle in flour and whisk for 1 minute. Slowly add cream, stirring constantly. Simmer until slightly thickened, then stir in Parmesan and Dijon mustard if using. Season to taste.
Return the chicken to the pan, spoon sauce generously over the top. Let simmer for 2 minutes. Garnish with parsley and serve hot.
Notes
Use freshly grated Parmesan for best flavor and avoid overcrowding the pan to keep the coating crisp.