Preheat oven to 375 degrees F. Lightly coat a 24-cup mini muffin tin with nonstick spray; set aside.
In a large bowl, combine flour, cornmeal, baking soda and salt. In a large glass measuring cup or another bowl, whisk together buttermilk, sugar, butter and egg. Pour mixture over dry ingredients and stir using a rubber spatula just until moist.
Scoop 1 tablespoon batter into each cup and place 1 hot dog piece into the center.
Place into oven and bake for 8-10 minutes, or until golden brown.