In a large mixing bowl, add cake mix, milk and eggs and mix well.
Preheat waffle iron according to appliance directions. Use a pastry brush to coat iron with oil so the waffles don't stick.
For a my Belgium waffle maker, I used ¾ cup of batter to make one waffle. Pour batter into iron and cook according to appliance directions (mine takes about 2 minutes per waffle). Remove from iron and serve topped with yogurt and sprinkles.