In a heavy bottom pot over medium high heat melt butter. Add flour and cook to blond roux.
Gradually add milk to the roux, stirring constantly to avoid clumping, until sauce has thickened. Add mustard, salt, and pepper to sauce. Stir to combine.
Remove from heat and add cheese. Stir until fully melted. Use for prep or hold hot for service.
CHEF’s TIP!
This sauce makes a great dip for soft pretzels or chicken tenders.
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