Ingredients

• 2 strips bacon, thinly sliced
• 2 tablespoons unsalted butter
• 1/2 yellow onion, chopped (about 1 cup)
• 2 cloves garlic, smashed
• 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), 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 8 1/4-inch-thick pieces
• 4 ounces cheddar cheese, cut into 8 thin slices

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Instructions

1. Cook the bacon in the butter in a medium saucepan over low heat until it renders slightly, about 2 minutes. Add the onion, garlic and celery seed and cook until soft, about 4 minutes. Scatter the flour over the mixture and stir to coat. Gradually add the broth and the milk, whisking until smooth.
2. Add the potatoes and sliced broccoli stem; increase the heat to medium and simmer, covered, until slightly softened, about 5 minutes. Add the broccoli florets and season with 1/2 teaspoon salt. Continue cooking, uncovered, at a rapid simmer until the vegetables are tender, about 5 minutes; season with salt and pepper.
3. Meanwhile, position a rack in the upper part of the oven and preheat the broiler to high. Spread the mustard on each piece of baguette and top with a cheddar slice. Place on a baking sheet and broil until the cheese melts; serve with the soup.