Heat oven to 400° F.
Grease 10-inch quiche dish or pie plate, 10-by-1½ inches.
Sprinkle bacon, cheese and onion in the plate. Beat remaining ingredients until smooth, 15 seconds in blender on high or 1 minute with hand beater.
Pour into plate. Bake until knife inserted between center and edge comes out clean, 35 to 40 minutes.
Cool 5 minutes.