Skillet Squash Casserole | America's Test Kitchen

Ingredients

• 2 tablespoons extra-virgin olive oil
• 3 cups thinly sliced onion (3 onions)
• 1 teaspoon table salt, divided
• 2 pounds yellow summer squash, halved lengthwise and sliced ¼ inch thick
• 2 garlic cloves, minced
• 6 ounces sharp cheddar cheese, shredded (1½ cups)
• 2 ounces American cheese, chopped (½ cup)
• 1/2 cup mayonnaise
• 4 scallions, sliced thin
• 1/2 teaspoon pepper
• Pinch cayenne pepper
• 30 Ritz crackers, chopped coarse