Thoroughly mix flours, baking powder and salt, set aside.
Sauté onions in a bit of oil and set aside.
In another bowl, whisk eggs then add in the flour mixture, whisking until smooth. Add the chillies and onions and blend well. Add sour cream, cottage cheese and cheddar cheese. Mix until well blended.
Pour into a buttered 13 x 9 inch baking pan and bake at 400°F for about an hour, or until top is lightly browned and center is cooked.
Notes
if you want to half this recipe, use only 4 eggs and put the mixture in an small oval corning ware dish. Can also pour mixture into an uncooked pie crust if you want to make it into a quiche.