Creamy Stovetop Panera Mac and Cheese

INGREDIENTS

16 oz

shell pasta, or your favorite shape (I prefer whole wheat)

4 tbsp

unsalted butter

1/3 cup

all-purpose flour

2 1/2 cups

2% milk

4 oz

white American cheese, chopped into small pieces*

8 oz

extra-sharp white cheddar cheese, shredded

1 tsp

Dijon mustard

1/2 tsp

kosher salt

hot sauce (optional)