Cheesy Chayote Au Gratin: A New Family Favorite!

Ingredients

• 2 large chayote squash (approximately 1.5 lbs / 680g), peeled, halved, and thinly sliced
• 1 medium yellow onion, finely chopped (about 1 cup / 150g)
• 3 cloves garlic, minced
• 4 tablespoons (57g) unsalted butter
• 4 tablespoons (30g) all-purpose flour
• 3 cups (720ml) whole milk
• 1 teaspoon smoked paprika
• 1/2 teaspoon ground nutmeg
• 1/4 teaspoon cayenne pepper (optional)
• 1 1/2 cups (approximately 170g) shredded Gruyere cheese, divided
• 1 cup (approximately 113g) shredded sharp cheddar cheese, divided
• Salt and freshly ground black pepper to taste
• 2 tablespoons breadcrumbs (plain or panko)
• 1 tablespoon olive oil