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Step 1
Add the heavy cream, cream cheese, and butter to a medium sauce pan and cook over medium heat until the butter and cream cheese have melted.
Step 2
Whisk in the ground mustard and pepper.
Step 3
Remove from the heat and whisk in the cheddar and Gruyere until the mixture is smooth and creamy.
Step 4
Serve immediately as the sauce will thicken as it cools.