This is not set in stone on how to make this. I always change it everytime I make it.

mix flour and a little bit of milk in a bowl to make a paste (this helps with clumps)

add the bowl mixture to a pot with heavy whipping cream and slowly add milk. stir constantly on med-high heat on stove top until thickened.

once thickened. lower heat to low and add potatoes (best if put in crockpot on high heat now and lower it to low or constantly stir in pot otherwise it'll get scalded)

add salt, pepper, basil, crushed mint (you can add more to fit your taste)

let it cook until potatoes have softened and serve!