Mama's Summer Squash Casserole
Ingredients:
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8 yellow summer squash, thinly sliced
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1 small yellow onion, thinly sliced
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1 egg, lightly beaten
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1 cup low-fat sour cream
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1 sleeve buttery round crackers (such as RitzĀ®), crushed, divided
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2 cups shredded sharp Cheddar cheese, divided