Summer Squash Gratin

Summer Squash Gratin was pinched from <a href="http://melissassouthernstylekitchen.blogspot.com/2013/08/summer-squash-gratin.html" target="_blank">melissassouthernstylekitchen.blogspot.com.</a>
INGREDIENTS
1 1/2 lb zucchini, 1/4" slices
1 1/2 lb yellow squash, 1/4" slices
1 medium sweet onion, small dice
1/2 cup butter or margarine plus 2 Tbsp, divided
1 Tbsp Dijon mustard
1/3 cup AP flour
1 tsp salt
1/2 tsp white or black pepper
1/2 tsp garlic powder
3 cups milk
3 cups shredded sharp cheddar cheese, divided [white or yellow]
1 sleeve buttery round crackers, crushed [I used Ritz Roasted Vegetable]
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