Preheat oven to 375° F. Lightly coat a 12-cup muffin tin with nonstick spray; set aside.
In a large bowl, combine flour, cornmeal, baking soda and salt. Melt butter. In another bowl, whisk together buttermilk, butter, sugar and eggs. Pour wet mixture over dry ingredients and stir just until moist.
Scoop batter into each muffin tin cup until halfway full. Place into oven and bake for 8-10 minutes, or until golden brown.
Remove pan from oven and cool on a wire rack for 10-15 minutes before removing muffins from pan.
Meanwhile, cut hot dogs into 1/2 inch thick coins. Place a large skillet over medium heat and cook hotdog slices, turning occasionally with a fork until slightly browned.
Slice each muffin in half horizontally, add hot dog slices and garnish with mustard, ketchup and relish as desired. Eat as you would a traditional slider!
