Cheese Straw Biscuits with Country Ham

Name: Cheese Straw Biscuits with Country Ham
Ingredients: 4½ cups sifted all-purpose flour; 1½ tbsp. baking powder; 1 tsp. baking soda; 1 tsp. sugar; 1 tbsp. dry mustard; 2½ tsp. kosher salt; 1 tsp. garlic powder; ½ tsp. cayenne; ¾ cup cold unsalted butter, cut into small cubes; 8 oz. extra-sharp cheddar cheese, freshly shredded; 1¾ cups buttermilk; Tomato chutney-mustard butter (recipe follows); 12 oz. thinly sliced cooked country ham; ½ cup salted butter, softened; ¼ tsp. dry mustard; 2 tbsp. tomato chutney; 1 tbsp. grainy Dijon mustard