I receive this response from a representative of GreenChef (8/22/23), and they advised their ingredients are NOT safe for Celiacs. I don't know if they were at the time of this article:
Thank you for your interest in our naturally gluten-free options.
These recipes are a great option for some of our customers with dietary restrictions, adding delicious...
I'm moving to Washington DC from the UK soon and was hoping for some coffee shop recommendations. Chains or locals.
I'm mainly worried about cross-contamination with gluten from oat milk in the milk frothing process, so any shops that don't use oat milk, use gluten-free oatmilk, or seperate equipment, etc.