Add milk, cream, salt, dry mustard, pasta and butter into a medium
sized pan.
2. Bring the mixture to a simmer, stirring frequently, over medium
heat. Once at a simmer, turn heat down to low.
3. Cook and stir frequently for about 20 minutes, until most of the
liquid is absorbed. Add 1/4 more milk if pasta is not fully cooked.
4. Remove from heat and stir in cheeses. Cover and let stand for at
least five minutes.
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