Here are some more, not yet mentioned:
Scarlatti, although Italian, lived the last 23 years of his life in Spain, and composed most of his 555 sonatas there. According to Kirkpatrick (Domenico Scarlatti - Princeton)
This music ranges from the courtly to the savage, from an almost saccharine urbanity to an acrid violence. Its gaiety is all the more intense for an undertone of tragedy. Its moments of meditative melancholy are at times overwhelmed by a surge of extrovert operatic passion. Most particularly he has expressed that part of his life which was lived in Spain. There is hardly an aspect of Spanish life, of Spanish popular music and dance, that has not found itself a place in the microcosm that Scarlatti created with his sonatas. No Spanish composer, not even Manuel de Falla in the 20th century, has expressed the essence of his native land as completely as did the foreigner Scarlatti. He has captured the click of castanets, the strumming of guitars, the thud of muffled drums, the harsh bitter wail of gypsy lament, the overwhelming gaiety of the village band, and above all the wiry tension of the Spanish dance.https://pianoforum.net/smf/index.php/topic,2339.msg20064.html#msg20064(Scarlatti favourite sonatas – almost 200 sonatas graded and commented).
Juan Arriaga (1806 –1826), considered the Spanish Mozart, died at 19, but still found the time to write three pieces for keyboard: Estudios o caprichos
Sebastian Albero (1722 – 1756) – If you are into classical sonatas but tired of Mozart and Haydn, he is your man: he wrote 30
Oscar Esplá (1886 –1976) – Modern writing, his op. 54 (“Lyrica Española”) is very rhythmical and “Spanish”.
Rodolfo Haffter (1900- ?) – Although born in Spain, Haffter became a Mexican citizen in the late 1930s. His 11 bagatelles op. 19 are particularly nice with very sophisticated writing (technically not difficult).
And then, don´t miss on Victor Carbajo:
https://www.pianoforum.net/smf/index.php/topic,8368.0.html(Victor Carbajo)
I am sure there is much more.
Best wishes,
Bernhard.