Directions

1. Butter a 2-quart shallow baking dish (oval or square); set aside. In dish, alternately arrange, cut side down, muffin halves and Canadian bacon. Sprinkle with cheddar and Parmesan cheeses. Set aside.
2. In a large bowl, whisk together eggs, milk, mustard, 1/2 teaspoon salt, a pinch of pepper, and hot sauce until combined. Pour over muffins and bacon; cover tightly with plastic wrap. Refrigerate at least 2 hours and up to overnight.
3. Preheat oven to 350 degrees. Place baking dish on a rimmed baking sheet; remove plastic wrap. Bake until puffed and set in the center (see note above), about 1 hour and 30 minutes. (Tent loosely with foil if strata starts to brown too quickly.) Let stand 10 minutes before cutting and serving.