Lightly grease a 12 hold muffin tin, or line with paper liners.
Sieve the flour, mustard powder and paprika into a large mixing bowl. Rub in the butter with your fingertips until this resembles breadcrumbs. Stir in the ham and grated cheddar cheese, then stir in the egg and milk.
Spoon equal amounts into the prepared muffin cups and sprinkle the tops with Parmesan cheese.
Bake for 20 minutes. Remove to a wire cooking rack and serve warm.