In a bowl, whisk buttermilk, Splenda Sweetener and eggs until well combined. Add in vanilla, butter, and salt. Sprinkle the flour and baking powder on top, and mix just until incorporated – do not over mix. Let batter set 5 minutes while waffle iron heats up.
Spray a classic waffle iron with nonstick cooking spray. Scoop about ¼ cup batter into each compartment. Cook waffles according to waffle iron’s directions. Churro waffles are really good a little more toasty and crunchy than normal.
Remove waffles and spray with butter-flavored nonstick cooking spray (or brush with butter).
Mix 1 cup Splenda Sweetener and cinnamon together in a bowl, and sprinkle on both sides of each waffle.