What can I do with leeks?

we cut them in half, clean out any sand/dirt, and slice into 1/4 to 1/2 inch slices. peel some potatoes and slice like for mashed, but cook in chicken broth along with leeks, until potatoes are tender. do not drain. mash all. add enough milk to make a soup thickness. we even throw in cheddar to make cheddar potato soup