Preheat your waffle maker.
In a mixing bowl whisk together flour, cornstarch, baking powder, baking soda and salt for 20 seconds and set aside.
In a separate mixing bowl whisk together buttermilk, milk, vegetable oil, vanilla extract and egg yolks until combined.
In the bowl of a mixer whisk the egg white on high until soft peaks form.
Add the sugar and whip until stiff peaks form.
While whisking, pour buttermilk mixture into well in flour mixture and mix just until combined.
Fold in egg white mixture, the mixture will be lumpy.
Gently fold in your sprinkles. Cook batter in waffle iron according to manufactures directions.
Serve warm with whipped cream.