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Heat oven to 400°F. |
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Microwave pot roast according to package directions. Break up any large pieces. |
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While pot roast heats, quick-thaw green beans by rinsing with cool water in a colander until thawed. Squeeze beans to thoroughly drain excess moisture. |
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Microwave mashed potatoes according to package directions. Stir milk, salt and pepper into heated potatoes. |
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While potatoes heat, spread pot roast with gravy in bottom of 9x13-inch casserole dish. Layer thawed green beans and drained mushrooms over roast. Spread cream of mushroom soup over beans and mushrooms. Top with mashed potatoes and sprinkle French fried onions over casserole. |
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Cover loosely with foil and bake 20 minutes. Serve while hot |
