Old Squash Casserole – Sylvia's Soul Food Brand

Ingredients

• 6 tablespoons unsalted butter, divided
• 3 pounds yellow squash, sliced ¼-inch thick (from 5 medium squash)
• 1 medium-size yellow onion, chopped (about 1 ½ cups)
• 2 teaspoons kosher salt, divided
• 2 large eggs, lightly beaten
• 1 (8-oz.) container sour cream
• 4 ounces sharp Cheddar cheese, shredded (about 1 cup)
• 2 ounces Swiss cheese, shredded (about ½ cup)
• ½ cup mayonnaise
• 2 teaspoons chopped fresh thyme
• ½ teaspoon Sylvia’s Secret Seasoning
• 2 sleeves round buttery crackers (such as Ritz), coarsely crushed
• 1 ounce Parmesan cheese, shredded (about ¼ cup)