Cheesy Brussels Sprouts Gratins Not Your Nans Recipe

Ingredients

• 1 pound (450g) Brussels sprouts, trimmed and halved (or quartered if large)
• 2 tablespoons (30ml) olive oil
• 1 medium shallot, finely chopped
• 2 cloves garlic, minced
• Salt and freshly ground black pepper to taste
• 3 tablespoons (45g) unsalted butter
• 3 tablespoons (25g) all-purpose flour
• 2 cups (475ml) whole milk
• 1/4 teaspoon freshly grated nutmeg
• 1/2 teaspoon Dijon mustard
• 1 cup (115g) shredded Gruyère cheese
• 1/2 cup (55g) shredded sharp cheddar cheese
• 1/4 cup (25g) grated Parmesan cheese
• 2 tablespoons breadcrumbs (panko or homemade)