Flatten chicken breasts to 1/8"
Season one side with salt and pepper.
Finely chop herbs and onion, and mince garlic. Combine and distribute in center of flattened chicken breasts.
Quarter half stick of butter lengthwise and add to center of chicken with herbs.
Roll chicken around herbs and butter using Saran Wrap to wrap and tightly secure. Refrigerate for at least 1 hour.
Remove chicken from wrap after chilled. Dredge in flour, then egg scrambled with 1 teaspoon of cool water, then panko breadcrumbs mixed with grated parmesan.
Heat 1 tablespoon each of olive oil and butter in an oven proof or cast iron skillet. Cook each side of chicken 5-10 minutes until golden browned and no longer pink.
Bake 400° for 15-20 minutes until internal temp is 165°. Spoon pan drippings over chicken before serving.