INGREDIENTS
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1 1/2 lb zucchini, 1/4" slices
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1 1/2 lb yellow squash, 1/4" slices
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1 medium sweet onion, small dice
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1/2 cup butter or margarine plus 2 Tbsp, divided
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1 Tbsp Dijon mustard
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1/3 cup AP flour
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1 tsp salt
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1/2 tsp white or black pepper
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1/2 tsp garlic powder
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3 cups milk
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3 cups shredded sharp cheddar cheese, divided [white or yellow]
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1 sleeve buttery round crackers, crushed [I used Ritz Roasted Vegetable]