Mash & Cheese | Meals from Memory Recipes–Our Place

Ingredients

• 6 large potatoes (about 2½ pounds total; I like half Yukon Golds and half russets), peeled and cut into 1-inch cubes
• Kosher salt
• 4 tablespoons (½ stick) unsalted butter
• 2 tablespoons all-purpose flour
• ½ teaspoon mustard powder
• 1 cup whole milk
• 1½ cups freshly grated sharp cheddar cheese
• 1 cup freshly grated Gruyère cheese
• Panko breadcrumbs (optional)
• 1 tablespoon unsalted butter, melted (optional)
• Finely chopped fresh chives, for serving