Season chicken breasts on both sides with salt and black pepper.
Set up a dredging station with three shallow bowls: one with flour, one with beaten eggs, and one with panko breadcrumbs.
Dredge each chicken breast in flour, dip into egg wash, then coat thoroughly with panko, pressing firmly to adhere.
In a large skillet, heat olive oil and 2 tablespoons of butter over medium-high heat.
Fry chicken cutlets for 4 to 5 minutes per side until the crust is golden brown and the internal temperature reaches 165°F (74°C). Remove chicken and tent with foil.
Wipe the skillet clean and melt the remaining 2 tablespoons of butter over medium heat.
Add minced garlic and sauté for 60 seconds until fragrant but not browned.
Pour in chicken stock to deglaze the pan, scraping the bottom with a wooden spoon to release browned bits.
Whisk in heavy cream and bring to a gentle simmer; cook for 3 to 4 minutes until slightly reduced.
Stir in Parmesan cheese, parsley, and thyme, whisking until the cheese is melted and the sauce is smooth.
Stir in lemon juice and remove from heat.
Spoon the sauce over the crispy chicken cutlets immediately before serving.