Valhalla Cupcakes (The Cursed Painting Series Book 1) by Cassidy Cayman

Audrey Allen thought she was about to live her dream of running her own cupcake shop. Now she’s got loan sharks breathing down her neck for a hundred thousand dollars she doesn’t even owe, and her five hundred year old painting of a sexy Viking just came to life.
Fortunately for her, he has to do whatever she says, and pretty soon, he’s stirring up more than just cupcake batter.