Cook pasta according the the al dente directions

Heat a skillet or pot on medium low heat. Add the butter and whisk until melted, add in the flour and whisk until combined.

Slowly whisk in the milk a little at a time. Once all the half and half is whisked in reduce heat to low and let simmer just until thickened.

Whisk in the mustard, garlic powder, cayenne, until combined.

Turn off the heat and add the cheeses and whisk until melted.

Add in cooked pasta