Cut 6 slices bacon in small pieces and pan-fry until crisp. Remove, drain. Cook onion in bacon fat until golden brown. Drain.
Cook spinach as directed on package. Drain thoroughly.
Blend eggs, milk and seasoned salt. Add spinach, onion and cooked bacon. Turn into pie shell. Bake in moderate oven (375°F.) until filling is set, 40 to 45 minutes.
Meanwhile, cut remaining slices of bacon in small pieces and pan-fry until crisp and brown. Drain and sprinkle on top of pie just before serving.