Arrange the broccoli in the bottom of a 9" x 13" baking dish. With kitchen scissors, cut the chicken into large, fork-size chunks and place them on top of the broccoli. Drain the mushrooms and layer them on top of the chicken. Use a whisk to combine the soup, mayonnaise, lemon juice, curry powder, and sherry. Pour the sauce over the chicken. Sprinkle with cheese.
Combine the bread crumbs, parsley, and butter and sprinkle the mixture on top of the casserole. Bake for 35 minutes, or until heated and bubbly.
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