1. Mix together the flour, cornstarch, baking powder, baking soda, and salt in one bowl.
2. Mix the sugar, milk, sour cream, oil, egg, and vanilla in a second bowl.
3. Add the wet ingredients into the dry ingredients and mix well until you have a smooth batter.
4. Heat a waffle iron until super hot. Spray nonstick spray and then ladle a spoonful of batter onto the waffle griddle. Close and cook until done (see note).
5. Top with tahini, silan, whipped cream, and sliced bananas.