Just past the Boerne Toyota dealership, there are some delicious, homestyle treats waiting for you! At Hilary Deville’s Opal & Onyx Cookie Co., all baked goods are made from scratch, with
After a job loss at the height of the pandemic, Deville decided she wanted to start her own
business. Deville, complete with her love of food, decided to embark on a journey of learning
to bake. She described baking as a science that took her over a year of research and trial and
error to practice - and to then develop her own recipes.
Opal & Onyx prides itself in its homestyle way of baking: all cookies are handmade and
“perfectly imperfect” as described by Deville. The cookie company has a mainstay menu of
cookie flavors that are always on the menu, as well as a range of rotating flavors with names that
are all geologically inspired due to Deville’s undergraduate degree in geology. It isn’t everyday
you are able to secure a “peridot pistachio” cookie.
In accordance with this theme of gemstones and geodes, Deville gained inspiration for her business’ name from the juxtaposition of the opal and onyx stones. Opal is a bright,
pearlescent stone that contrasts directly against the dark and rougher tones of the onyx. Together, Deville said, "they create a kind of Yin and Yang appearance."
And what’s more, Opal & Onyx caters: including everything from local cookie delivery
to intricately decorated cookie cakes for weddings. A customer is welcome to place orders online
or come into the store to order in person. As well as being a local, woman-owned
business, Opal & Onyx strives to support other women locally as well; all retail items in-store
are sourced from women-owned businesses.
When asked about her favorite part of what she does, Deville said that it’s a rewarding
experience to have a business that she can call her own. And, Deville furthered that she loves
being able to celebrate every day with her customers, no matter the occasion. Whether you’re
looking for the geode-inspired cookie of your dreams or a quality, home-baked treat, Opal &
Onyx Cookie Co. has all the bases covered.