Ham and Scalloped Potatoes

Ingredients (11)

• + cooking spray add to pantry
• ✓ 8 potatoes, peeled and thinly sliced
• + ½ cup butter add to pantry
• + 1 onion, finely chopped add to pantry
• ✓ ½ cup all-purpose flour
• + 2 teaspoons Dijon mustard add to pantry
• ✓ 1 teaspoon salt
• + ¼ teaspoon ground black pepper add to pantry
• + 3 cups milk add to pantry
• + 2 cups shredded Cheddar cheese add to pantry
• + 3 cups diced ham add to pantry