bell pepper-and squash casserole

Ingredients For bell pepper-and squash casserole

• 3 lb

  yellow summer squash sliced
• 3

  red bell peppers sliced into strips
• 1 c

  finely chopped yellow onion
• 4 clove

  garlic miinced
• 1 Tbsp

  plus 1 teaspoon salt divided
• 4 c

  shredded white cheddar cheese, divided
• 3 c

  crushed saltine crackers, divided apr.2 sleeves
• 1 (16) oz

  container sour cream
• 1 lg

  egg lightly beaten
• 2 Tbsp

  fresh thyme leaves
• 1 tsp

  ground black pepper
• 5 Tbsp

  butter,melted