I usually grow broccoli, Daikon Radish and sunflower microgreens in my indoors and outdoors. These can be harvested within a few days are very easy to grow. Moreover, they are delicious too and can be added in any of your dishes. Yes, I also use every type of bean seed and popcorn is a great idea. Nowadays, various microgreen and refill kits are available in the market containing all the required material along with instructions on growing them. It will help in a great way and you can enjoy your microgreens.