Bacon and Caramelized Onion Mac and Cheese

Name: Bacon and Caramelized Onion Mac and Cheese
Ingredients: 2 large sweet onions, sliced (4 cups); 1 package (16 oz) uncooked penne rigate pasta; 1 tablespoon butter or margarine; 2 tablespoons Gold Medal™ all-purpose flour; 1/2 teaspoon salt; 1/4 teaspoon pepper; 1/2 teaspoon Dijon mustard; 2 cups fat-free (skim) milk; 1/2 cup reduced-fat sour cream; 2 oz Gruyère cheese, shredded (1/2 cup); 3 slices bacon, crisply cooked, crumbled; 1/2 cup Progresso™ panko crispy bread crumbs; 1/4 cup chopped fresh basil leaves