Preheat your oven to 375 degrees.
Spray your dish with cooking spray. I used a 1.25 qt dish, you can also use a 9x9 or a pie plate.
I cooked my bacon, let it drain on paper towels then crumbled it.
Then throw the onions into the bacon grease to saute them till soft and got them out with a slotted spoon.
Put your onion, cheese and crumbled bacon into the bottom of the casserole dish.
Mix together in a separate bowl the milk, eggs, and Bisquick.
Pour over you goodies in the casserole dish.
Bake for 30-40 minutes till eggs are cooked through.