Chipotle-Bacon Mac and Cheese

INGREDIENTS

• 3 teaspoons sea salt, divided
• 1 (16-oz.) package cavatappi pasta
• 2 tablespoons corn oil, divided
• 1/2 cup butter
• 1 small onion, diced
• 3 tablespoons all-purpose flour
• 3 cups half-and-half
• 2 cups heavy cream
• 1 teaspoon ground white pepper
• 3 cups freshly grated smoked Cheddar cheese
• 1 cup freshly grated Cheddar cheese
• 1 teaspoon ground chipotle chile pepper
• 6 cooked bacon slices, chopped
• 3/4 cup panko (Japanese breadcrumbs)