- Spread onion and tomato in a 9-inch pastry shell.
- Mix eggs, yogurt, milk, salt, pepper and basil.
- Pour into pastry shell.
- Sprinkle cheese over top.
- Bake at 400 degrees ot 10 minutes.
- Then bake at 350 degrees for 35-40 minutes or until a knife comes out clean.
- Let sit for 5 minutes before serving.