Cheesy Gnocchi Casserole with Ham and Peas

INGREDIENTS

• Kosher salt and freshly ground black pepper
• 1 cup frozen peas, thawed
• 1 cup shredded Swiss or Gruyere cheese
• 1/2 teaspoon chopped fresh thyme
• One 17.5-ounce package potato gnocchi
• One 8-ounce piece deli ham, diced
• 1/2 cup low-sodium chicken broth
• 1 tablespoon unsalted butter
• 1/4 cup heavy cream
• 1 onion, chopped