Jess Bartlett from CakeThat! is transforming her signature business from a retail storefront to an online bakery called Sandwich Company that will ship all over the country. In another outreach to bring the gourmet desserts to as many people as possible, all of Bartlett’s products will be made gluten-free and vegan. Demand, she said, is strong enough to support concentrating on that option alone.

Building a warehouse-baking center in her hometown of West Creek is the latest in a flurry of creativity that started…