Cheesy Tennessee Onions with a Savory Twist (Baked Side)

Ingredients

• 3 large Vidalia onions, peeled and cut into 1/2-inch rings
• 2 tablespoons unsalted butter
• 1 tablespoon olive oil
• 3 cloves garlic, minced
• 1 tablespoon fresh thyme leaves
• 1 tablespoon Worcestershire sauce
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper
• 1 cup (120 g) sharp cheddar cheese, freshly grated
• 1 cup (120 g) Gruyere cheese, freshly grated
• 1/4 cup (30 g) panko breadcrumbs (optional)
• 1 tablespoon chopped fresh parsley, for garnish