Recipe: Ham and Cheddar Lunch Box Muffins

Name: Recipe: Ham and Cheddar Lunch Box Muffins
Ingredients: 1 1/2 cups all-purpose flour; 1/2 cup stone-ground yellow cornmeal; 2 teaspoons baking powder; 1 teaspoon garlic powder; 1/2 teaspoon baking soda; 1/2 teaspoon salt; 1 1/4 cups buttermilk; 2 large eggs; 7 tablespoons unsalted butter, melted and cooled, divided; 1 cup shredded sharp cheddar cheese; 8 ounces thick-cut deli ham (1/2-inch thick), diced, divided; 3 tablespoons finely chopped chives, divided; Freshly ground black pepper