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Cut the chorizo sausages in slices and cook them for a couple of minutes in a pan over medium heat. When lightly browned, remove from pan to a cutting board and chop them roughly. Cut the bread into 1 inch cubes and add them to the pan to absorb some of the juices left from cooking the sausage.
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Prepare a 9×13 inch baking pan and butter it well. Add cubed bread and distribute evenly in the pan. Sprinkle 2/3 of the cheddar cheese and Parmesan over, add sliced mushrooms and tomatoes over and top with cooked Chorizo sausage.
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In a large bowl, whisk together eggs, milk, salt and pepper and pour this mixture over the bread, cheese and veggies, evenly and allow to sit and soak up for 10 minutes.
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Meanwhile preheat oven to 325F.
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Bake uncovered for 40-50 minutes, checking from time to time not to get too browned on top. If it does get too brown cover with foil and remove when almost done.