In a bowl, add rice, sprouts, rice vinegar, sesame seeds, and shoyu. Mix well.
Line a measuring cup with plastic wrap - I used 1/3 cup. Stuff the measuring cup partially with the rice and sprouts mix. Then, add in a small spoonful of the avocado filling in the middle. Top it off with more rice/sprouts mix and press down into the measuring cup.
Take onigiri out of the measuring cup and set aside. Repeat with the remaining rice and avocado filling.
Once you've made all the onigiri, spread some shichimi togarashi and sesame seeds onto a plate. If you don't have any shichimi on hand, more sesame seeds with do. Roll the onigiri on its side through the spice, then set aside. Repeat with all the remaining onigiri.
Cut the sheets of nori into strips. Wrap the strips halfway around the onigiri (see photos for reference), and cut off any excess nori.
Serve immediately - nori can get chewy if left out too long.
Enjoy!