Place a cast-iron corn bread stick mold pan in oven. Preheat oven to 400°. Weigh or lightly spoon flour into a dry measuring cup. Combine flour, cornmeal, baking powder, and salt. Stir in buttermilk, melted butter, canola oil, and egg, beaten. Remove pan from oven; divide batter among 6 corn bread stick molds. Bake at 400° for 12 minutes or until lightly browned on top.