I really liked this cookbook: https://www.amazon.com/Around-World-80-Purees-Recipes/dp/1594748950/ref=mp_s_a_1_1?adgrpid=59806844321&gclid=Cj0KCQiAkMGcBhCSARIsAIW6d0CYSTdvZOujLyPQtz9Epr2J6ZTlwyE7iVcfernhDpx_p6uEQCa7in0aAmNREALw_wcB&hvadid=274706779586&hvdev=m&h.... Your kiddo may be a little old for it, but all of the food was really good!
This is a great book for what you are asking. I used it with my first boy and I'm excited to start using it again with my second baby in a couple months! Also, a couple of my favorite go-to easy foods are mashed avocado, mashed banana, and baked sweet potato.