How to Make It
Preheat the oven to 400°. Line three 12-cup mini-muffin tins with paper or foil liners. Alternatively, lightly butter and flour the cups, tapping out any excess flour.
In a small bowl, whisk the buttermilk with the egg. In a medium bowl, whisk the flour with the cornmeal, baking powder, baking soda, sugar and salt. Whisk in the chives and olives and 3/4 cup of the shredded cheddar. Add the buttermilk mixture and the melted butter; stir just until moistened. Spoon the batter into the prepared tins and sprinkle with the remaining 1/2 cup of cheese. Bake the muffins for about 16 minutes, or until golden. Let cool in the tins for 10 minutes before serving.