How to make tuna melt casserole

"This casserole recipe has all the goodness of a tuna melt but in casserole form...."

INGREDIENTS
1 16-ounce package rigatoni
4 tablespoons butter, divided
1 tablespoon olive oil
1 onion, sliced
2 tablespoons flour
2 cups milk
1 cup Swiss cheese, shredded
2 5-ounce cans of tuna, drained
1/2 cup Parmesan cheese, grated
1 teaspoon salt
1/2 teaspoon ground black pepper
3 tablespoons fresh chives, chopped
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