Preheat oven to 350F. Spray 8- x 8-inch baking dish with cooking spray; set aside. Cook bacon in large skillet over medium heat until crisp. Remove bacon from skillet, reserving 2 tablespoons of the drippings in skillet. Drain bacon on paper towels; set aside. Add onions and mushrooms to drippings in skillet; cook and stir 5 minutes, or until onions are crisp-tender. Crumble bacon. Add to vegetable mixture in skillet along with the diced tomatoes; mix well.
Layer 4 slices of bread, half of the vegetable mixture and 3/4 cup of the cheese in prepared dish. Repeat layers. Beat eggs, milk, mustard, Italian seasoning, salt and pepper in medium bowl with wire whisk until well blended. Pour evenly over ingredients in dish; press bread gently into egg mixture. Let stand 10 minutes.
Bake 30 to 35 minutes, or until knife inserted in center comes out clean. Cut into 6 pieces to serve.
I prepared this and refrigerated overnight like most stratas. We baked it for about 45 minutes and it was somewhat soggy in spots. I also trimmed the bread to fit in the 8 X 8 so it either needs another egg, less milk or full bread slices. The flavor is good but I would prefer fresh tomatoes andd garlic.
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