In a large bowl whisk eggs together until smooth. Add 1 cup cheddar cheese, swiss cheese, milk, ham, mushrooms, thyme, ground mustard, pepper, and salt. Stir to combine.
Spray a 9x13 pan with non-stick cooking spray. Line the bottom evenly with the cubed bread. Pour egg mixture over the cubed bread. Sprinkle with remaining 1/2 cup of cheddar cheese.
Cover with foil and refrigerate for 1 hour. Remove the dish from the refrigerator 30 minutes before baking and preheat the oven to 350°F.
Bake for 45 minutes. Remove foil and bake an additional 15 minutes.
Notes
I let my strata sit for 1 hour before baking. I recommend at least 15 minutes.
This recipe was calculated using the exact brands and measurements I used to make this recipe. If you are following a strict diet please note changing anything will cause the nutritional info to change. My calculations are intended as a guide only.