I recently bought a package of seeds to grow microgreens (Botanical Interests Microgreens Savory Mix for $3.99). We plan to plant a batch each day so we can enjoy fresh greens every day. We used potting soil + a little leftover topsoil and planted in whatever we could find. Day 1, we planted about 30 seeds in a small seed starting tray. Day 2 we found a disposable baking tin and planted about 40 seeds there.
We are just watering daily and waiting.