macaroni and cheese with green chilies

Ingredients

• 3 tablespoons butter, divided
• 1 cup diced onion
• 10 ounces pasta, I used orecchiette but you can use anything you like
• 2 tablespoons all-purpose flour
• 1-1/2 cup milk
• 4 ounces can green chilies
• 1 cup shredded Colby/Jack cheese
• 1 teaspoon Dijon mustard
• 1 teaspoon Kosher salt and pepper
• 1/4 cup Panko bread crumbs
• 1/4 teaspoon chipotle chili powder