Options and flavours include caramel heaven, a raspberry and almond slice, chocolate brownie and a fruity granola bar.
The new slices have their own colour-coded packaging, and display the Coeliac UK logo.
The Berkshire-based bakery, this year celebrating its 30th anniversary, has entered a gluten-free food sector already worth £288m (+25% year-on-year), according to the company.
Parry Hughes-Morgan, managing director, said: “Gluten-free has been at the front of our mind for some while now. There’s a limited range in the coffee shop world currently and most offerings are either not good to eat or unduly expensive.
“We’ve built a segregated ‘gluten-free bakery within a bakery’, and we continue to make the cakes by hand and from scratch as we always have. The only difference is that we’ve developed recipes that don’t contain gluten. As a result the cakes taste as good as our ‘everyday’ range and we don’t have to charge ‘free from’ prices.”