Maybe I'm biased, but my father, Timothy Williams, writes pretty good piano music! He mostly writes art songs, chamber music, and choral works, but here are some of his solo piano pieces.
Here's his charming Lullaby on the "Dies Irae" theme.
(performance by me)
A more extensive composition for piano, completed last year:
(I will eventually make a recording of this piece, but for now you will have to settle for a software-based rendition.)