Cheesy Ham & Potato Casserole

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Ingredients

2 pounds (about 915g) potatoes (I recommend Russet or Yukon Gold)
2 cups (about 300g or 8 ounces) cubed ham
1 and 1/2 cups (150g or 5.25 ounces) shredded sharp white cheddar cheese, divided
3 Tablespoons (43g) unsalted butter
3/4 cup (100g) chopped yellow onion (1/2 of a large onion)
3 garlic cloves, minced
3/4 teaspoon salt
1/2 teaspoon fresh ground pepper
1/2 teaspoon smoked paprika
1/2 teaspoon ground mustard
1 teaspoon dried parsley (or 2 teaspoons fresh chopped parsley)
3 Tablespoons (24g) all-purpose flour
2 cups (480ml) whole milk
optional, for garnish: chopped fresh parsley, green onion, chives, or hot sauce

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