Ceres
there is no goddess of vanilla. There was a goddess of growing stuff, demeter, in roman ceres. cereal comes from her roman name. Vanilla is a plant, so it's close
Demeter, Goddess of the Harvest and Persephone's mother
Ceres was the Roman Goddess of growing plants, harvest and motherly love.
The Roman goddess of the hearth was Vesta. The Roman goddess of grain was Ceres.
The Roman goddess of the Hunt is Diana. Her Greek equivalent is Artemis.
Felicitas was the Roman goddess of happiness.
The Roman goddess Minerva did not marry. She was a virgin goddess.
The Roman goddess of truth was Veritas.
Minerva was the Roman goddess of intellect.
Selene is the Greek goddess, the Roman equivalent is Diana or Luna.
They didn't have one that particularly devoted to one item of produce. Ceres is traditionally listed as a Goddess of growing plants, and of grain crops in particular. From her name we get the word cereal which we still use to describe these crops.
The planets are named after Greek and Roman Gods, who believed them to the spirits of the Gods and also had effect on our lives. As Ceres contains water it is possible however remote that it contains life or has the ability to have life, The Goddess was the Goddess of growing plants, the harvest and motherly love. The name seems fitting.