Baked Pickle Mac and Cheese

Name: Baked Pickle Mac and Cheese
Ingredients: Kosher salt; 1 pound cavatappi; 4 strips bacon; 4 tablespoons unsalted butter; 1/4 cup all-purpose flour; 4 cups whole milk, warmed slightly; 1 teaspoon mustard powder; 1/4 teaspoon cayenne pepper; 12 ounces dill havarti cheese, shredded (about 3 cups); 8 ounces extra-sharp cheddar cheese, shredded (about 2 cups); 3/4 cup finely chopped dill pickles, plus 1/4 cup brine; 3 cups dill pickle potato chips, finely crushed; 1 tablespoon chopped fresh dill; 1 tablespoon chopped fresh chives