Melt butter in skillet over medium-high heat. Pour milk in shallow bowl. Put crumbs and Parmesan in another bowl and mix. Dip each chicken breast half into milk, then into crumb mixture. Lightly fry in 2 tablespoons butter on both sides until golden brown, adding more butter if necessary. Pour spaghetti sauce over chicken. Reduce heat to low and simmer about 15 minutes, less if chicken is thin or small. Place cheese on top of chicken to melt. Serve with cooked pasta of your choice.