With loads of restaurant kitchens sitting underused, big chains are developing virtual brands to boost sales. Is there an opportunity here for aspiring foodservice operators? Not too long ago, many aspiring restauranteurs and chefs launched their new foodservice concepts with food trucks. These mobile restaurants allowed operators to get immediate sales feedback on their concept without the costs and hassles of a brick-and-mortar location. Cut to 2020, and the food truck has largely disappeared, thanks to ghost kitchens. Enterprising foodpreneurs can now rent space in a commissary kitchen and launch their food brand online through delivery-only channels. This emerging foodservice…