In Australia, we are legally required to list all ingredients and provide nutritional analysis for our customers. When selling at markets or in cafes I list all of the ingredients and my nutritional analysis (which I had analysed by a expert company) as well as a comment stating that my home registered kitchen also processes nuts/seeds and so a trace may be present. For private orders, I always include a sheet called 'Important information about your order' and it is here I list best before date, ingredients and nutritional analysis. It is up to the client to share that with their guests if they think it is necessary. I am therefore covering myself for all of the very strict food labelling laws in Australia. I'm not sure of the labelling requirements in the US though.