Cook the bacon crisp; crumble. Heat oven to 190ºC Separate dough into 4 rectangles. Place 2 rectangles in ungreased 20 cm square pan; press over bottom and 1 cm up sides to form crust, sealing perforations. Place cheese slices over dough. Sprinkle bacon and onions over evenly. Blend milk and eggs; pour over bacon. Separate remaining dough into triangles; arrange triangles over bacon-egg mix; do not seal. Bake for 30-35 minutes or until golden brown and filling is set.