I make it with whole milk, butter and pepper.
We also put it in Mac & Cheese when we want a cheese sauce. I’m getting hungry
Half an onion chopped. Butter and oil to saute.
Once onions are translucent add 1 ounce of flour for roux. Cook the roux until it doesn’t smell like raw flour.
Add Milk. 3-4 cups depending on how you like it. simmer with 1 clove, add salt and white pepper to taste.
Once it thickens add cheese.
Tillamook Cheddar is our choice usually because we’re in Oregon. You could do Gruyere with a little nutmeg for the French/Belgian version.
Pour over the potatoe rounds and cook for around an hour or so.