Preheat oven to 400°. Lightly grease a 9- X 13-inch baking dish and set aside.

Using a pastry blender or fork, work butter into flour. Stir in 1 egg, half and half and salt to make dough. Let stand in a cool place for a few minutes. Thinly slice onions. Fry bacon in a small skillet over medium heat until golden brown. Add onion rings and sauté 2 to 3 minutes. Drain off excess fat.

In a medium bowl, beat together whipping cream, 2 eggs, salt and pepper. Roll out dough on a lightly floured surface. Line greased baking dish with pastry. Prick pastry surface with a fork. Spread cooked bacon and onions over pastry. Pour in cream mixture. Cover with foil. Bake 20 minutes. Remove foil and bake 10 to 15 minutes longer or until set. Cut in squares and serve warm.