01 -
Thoroughly grease an 8x8 baking dish with butter.
02 -
Lay the potato slices evenly across the bottom of the dish.
03 -
In a saucepan, whisk together cream, milk, salt, pepper, mustard, and nutmeg.
04 -
On medium-high heat, stir until the mixture is almost boiling, which takes 5 to 10 minutes.
05 -
Add the shredded cheddar, lower the heat, and stir until the cheese is fully melted.
06 -
Drizzle the melted cheese sauce all over the potatoes.
07 -
Allow everything to sit for a moment and cool down slightly.
08 -
Evenly distribute butter pieces on top of the cheese sauce.
09 -
Sprinkle paprika generously over the entire dish.
10 -
Cover the casserole tightly using plastic wrap.
11 -
Store in the fridge for at least 12 hours, or overnight for best results.
12 -
Set your oven temperature to 350°F.
13 -
Bake for 45 minutes uncovered until bubbly and golden on top.