Heat oven to 375. Spray a 9 x 13" baking dish w/ cooking spray.
In small saucepan, melt butter, add garlic, stir. Pour into a shallow bowl. Place breadcrumbs into another shallow bowl.
Dip each chicken breast into butter/garlic mix, then roll in crumbs. Place chicken in baking dish. Combine left-over butter/garlic and breadcrumbs, and sprinkle over chicken breasts. bake for about 40 min, or until juices run clear.