Roasting chestnuts in the fireplace is a fine pastime, but doesn’t satisfy campfire cravings for s’mores. Lydia Blanchard is making them year-round at her gourmet marshmallow and s’mores shop, Sweet Lydia’s, in Lowell. The former nonprofit professional launched her business in 2009 and currently offers a half-dozen varieties of this tri-flavored treat. Individually-wrapped, single-serving s’mores ($23 for six) come in two wintertime flavors, mint chip and peppermint. Mint chip features chocolate grahams enrobed in thick white chocolate; peppermint comes with a honey-flavored cracker, dark-chocolate exterior, and crushed candy cane topping for extra crunch. Both sandwich a pillowy, but not overly gooey, homemade marshmallow center. No roasting time necessary. Sweet Lydia’s, 160 Merrimack St., Lowell, 978-888-7616.