Reddit reviews Piano Literature - Book 4: Developing Artist Original Keyboard Classics (The Developing Artist)

https://www.amazon.com/Piano-Literature-Developing-Original-Keyboard/dp/1616772824

I'm also a little beyond the 1 year mark. I use the Faber books with my teacher, and they have many graded pieces that are interesting yet challenging. I highly recommend buying these two books and working on them with your teacher:

http://www.amazon.com/Piano-Sonatinas-Developing-Original-Keyboard/dp/1616771135/ref=sr_1_4?s=books&ie=UTF8&qid=1459214456&sr=1-4&keywords=faber+sonatina

http://www.amazon.com/Piano-Literature-Developing-Original-Keyboard/dp/1616772824/ref=sr_1_6?s=books&ie=UTF8&qid=1459214509&sr=1-6&keywords=faber+music+literature

You can also get the Book 3s of the same title for more repertoire. There is such a variety of classical genres and periods in these books that you can really find meaningful and authentic works that both stretch your ability while also providing authentic sounding music.