Cook pasta according to package instructions.
In a heavy bottom pot, on medium-low heat, melt butter and stir in the flour. Cook for 5 minutes until the mixture begins to bubble and the flour dissolves. Stir in the heavy cream.
Add in the salt, ground mustard, paprika and white pepper.
Continue whisking and add in the cheese 1/2 cup at a time, whisking well in between each addition.
Stir in the cooked and drained noodles. Serve immediately. Enjoy!