Heather Hardcastle knows pastry. Diagnosed with gluten intolerance in 2000, Hardcastle set out to re-create her favorite foods without the troublesome protein found in wheat and other grains.

“It led to a career change,” says Hardcastle, who subsequently completed the general pastry program at the Culinary Institute of America in St. Helena. More recently, Hardcastle took on the roles of owner and founding chef when she opened San Anselmo’s Flour Craft Bakery in the spring of 2013. Perhaps best known for their granolas, sold on Thursdays at the Marin County Civic Center Farmers’ Market, on Saturdays at Larkspur’s Marin Country Mart Farmers’ Market, and at most regional Whole Foods Markets and other specialty stores, Flour Craft Bakery sells a range of gluten-free (and often vegan or paleo) baked goods, including breads, scones and brown-butter brownies.

At the bakery in San Anselmo, a newly expanded lunch menu includes savory quiche, sandwiches and salads. Beginning in November, Flour Craft Bakery granolas—cranberry almond and maple pecan—will be sold online at Williams-Sonoma.com.