Spray your 9 x 13 baking dish with nonstick spray.
Place the English muffin pieces over the bottom of the dish.
Sprinkle with the Canadian bacon, asparagus and cheeses.
In a large bowl, combine the eggs, milk, cream and sauce mix whisking well. Pour over the cheeses.
Sprinkle the chives on top. Cover with foil and refrigerate overnight.
The next day, remove from the refrigerator, uncover and let stand for 30 minutes before baking. Preheat your oven to 350 degrees.
Bake 60-75 minutes until center is set. Serve immediately.