Cheesy Potato Casserole Recipe The Ultimate Comfort Dish

Ingredients

• 2 1/2 lbs (1.1 kg) Yukon Gold potatoes, peeled and thinly sliced
• 1 medium yellow onion, thinly sliced
• 2 cloves garlic, minced
• 2 tablespoons (30 ml) olive oil
• Salt and freshly ground black pepper to taste
• 4 tablespoons (57g) unsalted butter
• 4 tablespoons (30g) all-purpose flour
• 3 cups (710 ml) whole milk
• 1/2 teaspoon ground nutmeg
• 1 teaspoon Dijon mustard
• 2 cups (225g) shredded cheddar cheese
• 1 cup (115g) shredded Gruyere cheese (or Swiss)
• 1/4 cup (25g) grated Parmesan cheese (Optional)
• 2 tablespoons breadcrumbs (panko or regular) (Optional)
• 1 tablespoon melted butter (Optional)