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Grease rectangular pan, 13x9x2 inches. Cook sausage in 12-inch skillet over medium heat 7 to 8 minutes, stirring occasionally, until no longer pink; drain. Melt butter in same skillet over medium-high heat. Cook spinach, zucchini, bell peppers and onion in butter about 5 minutes, stirring frequently, until zucchini is crisp-tender.