2 tbsp. chopped fresh chives
Kosher salt and freshly ground black pepper, to taste
1 1/2 cups shredded sharp cheddar cheese
1/2 tsp. garlic powder
2 tsp. Dijon mustard
2 oz. cream cheese
1 cup half and half, or more, as needed
2 tbsp. all-purpose flour
3 tbsp. unsalted butter
2 cups cauliflower florets
3 cups cavatappi pasta