In a small saucepan, whisk together the mustard, sugar, ketchup, vinegar, Worcestershire sauce, diced chipotle and adobo sauce, salt, and pepper. Heat until the sugar melts and the ingredients are combined, but do not boil. Remove from the heat and set aside.
Make the Roux:
Melt the butter in a medium saucepan over low heat. Sprinkle in the flour. Cook the flour and butter for 2 minutes, constantly stirring with a wooden spoon. Gradually stir in the half-n-half; bring to a low boil. Cook until thickened, stirring constantly, about 2 minutes.
Combine the Cheese Sauce:
Reduce the heat, add the cheese, and pour in the BBQ sauce base. Stir over low heat until the cheese is melted and everything is warmed through.
Serve:
Remove from the heat and serve immediately.
Notes
Taste and adjust sugar/vinegar for desired sweetness/tang.
Adjust thickness using a cup of milk instead of half-n-half for a thinner sauce or with heavy cream for a creamier, richer sauce.
Add more heat by adding extra chipotle, chopped jalapenos or your favorite hot sauce.
Cover cooling sauce to prevent skin.
Store in the fridge and reheat leftovers gently, adding liquid (milk) as needed. Discard after 4-5 days.
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