Make a roux: In a saucepan, melt butter over medium heat. Whisk in flour and cook for 1 to 2 minutes.
Add dairy: Slowly whisk in the warm milk and cream, stirring constantly until smooth and thickened (about 5 minutes).
Cheese it up: Reduce heat to low. Add shredded cheddar in small handfuls, whisking until fully melted and silky.
Season: Stir in mustard powder, garlic powder, salt, and pepper. Taste and adjust. Enjoy
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