Preheat oven to 400 F. Put breadcrumbs in a sheet tray and bake for 10 minutes or until golden brown. Take bread crumbs out of the oven and set aside.
Mix egg and milk in a shallow bowl. Put flour in a separate bowl. Season chicken breast with salt and pepper. Dredge chicken in flour, then egg/milk, then toasted breadcrumbs. Place chicken on a sheet tray and bake for 20 minutes.
While chicken is baking, heat sauce in a small pot on the stove.
Once the chicken is done, take out of the oven and top with sauce and cheese. Place back into the oven for 5 minutes. Cut muffin in half and place chicken on top of the bottom muffin and top with fresh basil and the top muffin.