Mama's Summer Squash Casserole

By Northerngirl

4.53 / 5

20min

40min

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8 yellow summer squash thinly sliced
1 small yellow onion thinly sliced
1 egg lightly beaten
1 cup low-fat sour cream
1 sleeve buttery round crackers (such as Ritz®) crushed, divided
2 cups shredded sharp Cheddar cheese divided