Squash Casserole 3 | Just A Pinch Recipes

Ingredients

• 1 stick(s) salted or unsalted butter
• 1 pound(s) yellow squash, large dice
• 1 pound(s) zucchini, large dice
• 1 medium onion, diced
• 2 cup(s) shredded sharp cheddar cheese, divided
• 1 pinch(es) salt
• 1 pinch(es) pepper
• 1 cup(s) milk, 2% (whole can be used)
• 2 tablespoon(s) all-purpose flour
• 1 large egg yolk
• - additional cheddar cheese topping