Heat oven to 200 degress C. Place foil liner in each of 12 regular-size muffin cups. Gererously spray each with cooking spray.
In a large bowl, mix potatoes, oil, salt and pepper. Divide evenly among cups, press lightly.
In a medium bowl, beat eggs and milk. Stir in bacon and cheese. Firmly press potatoes in muffin cups with bottom of 1/4 cup dry measuring cup. Top each with slightly less than 1/4 cup egg mixture.
Bake 13-16 minutes or until knife inserted in centre of egg comes out clean. Cool 5 minutes. Serve with sauce.