Mama's Summer Squash Casserole

Details

Ingredients

• 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