Preheat the oven to 400° F. Line a baking sheet with unbleached parchment paper.
In a large mixing bowl, combine the cassava flour, tapioca flour, salt, and baking powder. Whisk to combine.
Add the eggs and olive oil. Stir until a smooth dough forms. Knead the dough a couple of times with your hands. If it seems too sticky, add a little more tacioca flour until the dough can be handled.
Divide the dough into 4 equal portions. Shape them into a bun and place on the baking sheet.
Brush some scrambled egg onto each bun and sprinkle with seasame seeds. This step is optional and you can leave off the egg wash and the seasame seeds if desired.
Bake for 22-25 minutes. The buns should be golden brown. Allow the buns to cool on a cooling rack before slicing, toasting, and adding your burger!