01 -
Coat an 8x8 casserole dish generously with butter.
02 -
Distribute the potatoes evenly in the dish.
03 -
In a saucepan, whisk together the milk, cream, salt, mustard, pepper, and nutmeg.
04 -
Heat the mixture on medium heat while stirring, just until it’s close to boiling. This takes 5–10 minutes.
05 -
Toss the cheese into the warm mixture, turn the heat low, and stir until it’s fully melted.
06 -
Pour the cheesy sauce all over the potatoes.
07 -
Set it aside to cool down a bit.
08 -
Place the butter pieces on the surface.
09 -
Dust the top lightly with paprika.
10 -
Wrap the dish tightly using plastic wrap.
11 -
Pop it in the fridge for at least 12 hours, or overnight.
12 -
Preheat your oven to 350°F.
13 -
Bake it uncovered for 45 minutes.