Heat oven to 400˚ F. Coat mini muffin tins with cooking spray.  In a large mixing bowl, combine the flour, sugar, cornmeal, baking powder, and salt. Mix well. In a separate medium mixing bowl, combine the eggs, oil, and milk, and add this mixture to the dry ingredients. Mix just until the batter is blended.  Gently fold in the cheddar cheese and chives. Do not over-mix. Fill the muffin tins about three-quarters of the way full.  Bake for 8 to 10 minutes or until a toothpick comes out clean.  Cool for 5 minutes in the pan before removing to wire racks.