MICROWAVE:
In a 4-cup microwavable bowl, whisk milk with mix. Microwave, uncovered on high for 4–5 min, whisking halfway through or until thickened. Stir in cheddar until melted.
STOVE TOP:
In a saucepan, whisk milk with mix. Bring to a boil over medium-high heat, whisking constantly. Reduce heat; simmer, whisking often for 3 min or until thickened. Remove from heat and stir in cheese.
