1. Spray a shallow 2-quart baking dish ( oval or square)with cooking spray; set aside.
2. In dish, alternately arrange, cut side down, muffin pieces and Canadian bacon.
3. Sprinkle with cheeses and set aside.
4. In a large bowl, whisk together the eggs, milk, mustard, 1/2 t. salt, a pinch of pepper, and hot sauce until well combined.
5. Pour over muffins and bacon.
6. Cover tightly with plastic wrap and refrigerate at least two hours.
7. *Refrigerating overnight will give you an especially custardy consistancy.
8. Preheat oven to 350 degrees.
9. Place baking dish on a rimmed baking sheet;remove plastic wrap.
10. Bake until puffed and set in the center( a paring knife inserted in the center will come out clean) for about 1 hour and 30 minutes.
11. Tent loosely with foil if strata starts to brown too quickly.
12. Let stand 10 minutes before cutting and serving.