Cook vegetables until soft. Drain. Sauté onions in butter for 3-5 min.
Combine onions, soup, water chestnuts, mayonnaise, garlic powder & salt in a bowl.
Stir in the mixed vegetables & cheese.
Transfer to a baking dish. Top with crushed crackers & drizzle with melted butter.
Bake until the filling is bubbling & the crackers are browned.
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