In a small bowl, combine the paprika,…
In a small bowl, combine the paprika, garlic salt, salt, and black pepper.

In a small bowl, combine the paprika, garlic salt, salt, and black pepper.
In a pan over medium-low heat, melt the butter and add half of the seasoning mixture. Stir for about 30 seconds to bloom the spices, then add the flour and whisk continuously for 1–2 minutes.
Slowly pour in the whole milk and heavy cream, whisking continuously until smooth. Add the remaining seasonings and Dijon mustard. Stir over medium-low heat until the sauce begins to thicken; do not boil.
Reduce the heat to low, then turn it off. Gradually add the shredded cheeses and stir until completely melted and creamy.
Add the cooked pasta and mix until evenly coated.