Three-Cheese Macaroni and Cheese

olive oil

finely chopped onion (about 1 medium)

all-purpose flour

garlic clove, minced

1% low-fat milk

bay leaf

crumbled Gorgonzola cheese

grated Parmigiano-Reggiano cheese, divided

salt

uncooked elbow macaroni (about 8 ounces)

Cooking spray

(about 2 1/2 ounces) shredded part-skim mozzarella cheese

panko (Japanese breadcrumbs)

freshly ground black pepper