This Hot Cocoa Mug Cake uses simple ingredients for a delicious ... Cornstarch is a great arrowroot substitute. Maple syrup - Adds a nice rich caramel flavor and is refined sugar-free.

Preheat the oven to 350°. Butter and flour a 10-inch round cake pan. In a large saucepan, bring the maple syrup to a boil over high heat, then simmer over low heat until very thick and reduced to ...