Remove all fat from outside of chicken breast. Slice against the grain into ½ inch thick slices.
Add chicken to a large bowl. Pour on half the ranch and toss to coat. Add additional ranch as needed to coat chicken.
Spread chicken out on the bottom and up the sides of the bowl. Sprinkle with about half of the parmesan, breadcrumbs, and garlic. Toss to coat. Sprinkle with more parmesan, breadcrumbs, and garlic and toss again.
Spray an aluminum foil-lined cooking sheet with non-stick cooking spray. Place chicken in a single layer on baking sheet. Spray tops of chicken with cooking spray (this helps the chicken crisp up).
Bake on the bottom rack of your oven for 10 minutes or until chicken is done. Check chicken by slicing the thickest piece and looking for any pink color.