Pour the milk into a pot and whisk in the powdered cheddar cheese.
Add the butter and cheese cubes.
Melt over medium-low heat stirring often. Add additional milk to thin the cheese sauce, if desired. Serve immediately.
Video
Notes
Storage
Allow the leftovers to cool to room temperature. Store in an airtight container in the refrigerator for 3-4 days or in the freezer for up to two months.
Reheating
Allow frozen cheese dip to thaw in the refrigerator overnight. Reheat in the microwave on high, stirring every 30 seconds, until smooth and heated through.
Crock Pot
Whisk together the milk and powdered cheddar cheese. Add to a slow cooker with the remaining ingredients. Cover and cook on low for 1-2 hours, stirring occasionally, until smooth and heated through. Turn to the lowest setting for serving.