The Crimson Binome
Hero
Adding 3hp to the Goodberry spell doesn't necessarily add 3hp to each berry. RAW, it might not do anything at all (since the spell doesn't heal anything, and is just creating an item which does the healing). RAI, I believe there were suggestions that it just created three more berries.Multiclass Druid/Cleric with Disciple of Life and Goodberry adds 3 hp to the Goodberry spell and the land Druid can recover its spells to spam a lot of level 1 healing spells.
You can't blame shenanigans for being overpowered when those shenanigans are open to interpretation and less powerful interpretations exist.