Place butter in a baking pan and melt in oven at 250 degrees.
Meanwhile, mix together the bread crumbs, cheese, basil and seasonings in a shallow bowl (I like using a pie plate).
Remove pan of melted butter from oven and raise oven temp to 350 degrees.
Coat pieces of chicken in the melted butter in the pan, then coat with crumb mixture, pressing mixture into the chicken. Lay in a single layer in the remaining butter in pan.
Bake uncovered for 20 minutes.
Remove from oven. Spread a couple of tablespoons of spaghetti sauce over each piece of chicken, then top each with a slice of mozzarella.
Put back into the oven and cook an additional 10 minutes, or until the chicken is cooked to an internal temperature of 165 and the cheese is bubbling.