In a medium frypan cook onions in butter for about 10 minutes or until clear and soft; stir often. Reserve juices.
In a large bowl mix onions with eggs and sour cream. Stir in onion juices, butter and cheese. Add salt, pepper and hot sauce to taste. Make sure all ingredients are well blended and then pour into the 2 pie shells.
Sprinkle grated cheese and paprika on top of pies. Bake in preheated oven for 20 minutes. Lower temperature to 180 degrees C then bake for an additional 30 to 40 minutes or until lightly browned on top.
Let cool for a few minutes to settle before slicing.