1. In a mixing bowl, whisk together the eggs, egg whites, milk, mustard, chives, dill, cayenne pepper and salt.
2. Spray a 10-inch baking dish with nonstick spray. Arrange the slices of baguette in a single layer in the baking dish. Spread the crabmeat and roasted red peppers over the bread. Pour the egg mixture into the baking dish, cover and refrigerate for 30 minutes or overnight.
3. Preheat the oven to 325ºF.
4. Remove the strata from the refrigerator, uncover and sprinkle the Parmesan cheese over the top.
5. Bake the strata for 1 hour or until it is lightly browned and set in the center. Cool for 20 minutes before slicing.