Place flour in large bowl, add butter and shortening, blend for one minute, in pastry blender. Gradually add cold water until dough holds its shape. Place on floured work surface. Add prepared mixture. Roll out other half dough and place on top.
Flute edges by pinching two halves together tightly.
Cook bacon until crisp in 10-inch skillet. Drain on paper towels, crumble. Discard bacon fat. Add butter, when melted, add onion slices and crumbled bacon. Cook 12 to 15 minutes until onions are slightly soft.