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Preheat your oven to 350 degrees. Lightly spray a 9x13 inch casserole dish with non-stick cooking spray.
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In a large frying pan set over medium high heat, melt the butter.
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Add the onions and mushrooms and sauté until the onions are translucent and the mushrooms are tender, about 4-5 minutes.
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Stir in the water chestnuts and broccoli florets.
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Add the Progresso Broccoli Cheddar Soup, salt, and pepper; stir.
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Toss the cooked rice into the pan until all rice is incorporated into the mixture.
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Pour mixture into the prepared casserole dish and top with shredded cheese.
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Bake casserole until cheese is melted and bubbly, about 20-25 minutes.