Broccoli Chowder with Cheddar Toasts

Name: Broccoli Chowder with Cheddar Toasts
Ingredients: 2 strips bacon, thinly sliced; 2 tablespoons unsalted butter; 1/2 yellow onion, chopped (about 1 cup); 2 cloves garlic, minced; 1/2 teaspoon celery seed; 2 tablespoons all-purpose flour; 2 cups low-sodium chicken broth; 2 cups milk; 4 small red-skinned potatoes (about 6 ounces), scrubbed and quartered; 1/2 head broccoli (about 10 ounces), broken into florets, stem peeled and sliced; Kosher salt and freshly ground pepper; 1 tablespoon Dijon mustard; 1 baguette, sliced into eight 1/4-inch-thick pieces; 4 ounces Cheddar, cut into 8 thin slices