In a large mixing bowl combine: the flour, corn starch, sugar, baking powder, baking soda, and salt. Mix well.
Melt the butter in the microwave and allow a few minutes to cool.
Measure out 1 cup of milk into a measuring cup with space to add 1 cracked egg. Mix well to combine. Once the butter has cooled a bit, add it as well.
Make a well in the center of the dried ingredients and pour in the wet ingredients.
Mix it all together until it is just combined and there is no dry flour. Don't worry about it being lumpy, the lumps will cook out. You don't want to overmix the batter.
Allow the batter to sit out while the waffle maker heats up. The batter will thicken some as the flour and corn starch hydrate.
Once the waffle maker is hot. Brush butter on both top and bottom of the waffle maker then add your batter. If you using cheese add a small pile of it to the batter before closing the waffle maker.
Cook until the light goes out. Repeat this until you have cooked all the waffles.
Each 2 waffles as your burger buns. They should fit a 3 or 4 oz burger patty. You can make it a double patty if you want more meat.
Notes
If you don't have corn starch you can use all flour.