Ham and cheese breakfast casserole

Casseroles
ham and cheese breakfast casserole

6 tablespoons butter, plus more for greasing dish 1 large onion, thinly sliced Kosher salt and freshly ground black pepper 4 cups ½-inch bread cubes (crusts removed) 8 ounces cremini mushrooms, sliced 8 large eggs 1¼ cups half-and-half 1 teaspoon Dijon mustard Pinch cayenne 4 ounces ham, diced 1½ cups shredded Gruyere, Emmental or Jarlsberg (about 4 ounces) 2 small plum tomatoes, sliced very thinly 2 tablespoons grated Parmesan 2 tablespoons chopped parsley, for garnish

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