Creamy Swiss Chard With Crisp Bread Crumbs

Name: Creamy Swiss Chard With Crisp Bread Crumbs
Ingredients: 3 tablespoons unsalted butter; 1/2 cup all-purpose flour; 1 quart whole milk; 1 cup heavy cream; 1 small onion, quartered; 2 bay leaves; 1/2 pound Italian Fontina cheese, shredded (2 cups); Salt and freshly ground pepper; 7 tablespoons unsalted butter, 4 tablespoons melted; 1 tablespoon extra-virgin olive oil; 4 large garlic cloves, thinly sliced; 3 pounds Swiss chard, tough stems discarded and leaves cut into bite-size pieces; 2 cups fresh bread crumbs; 1/4 cup freshly grated Parmesan cheese