2 tablespoons chopped fresh chives
Kosher salt and freshly ground black pepper, to taste
1/4 cup freshly grated Parmesan
12 ounces shredded extra-sharp cheddar cheese, about 3 cups, divided
2 (12-ounce) cans evaporated milk
1/2 teaspoon onion powder
1 teaspoon paprika
3 tablespoons all-purpose flour
3 tablespoons unsalted butter
1/2 pound elbow pasta