Roll out dough and cut cookie using house cutter from set. Bake and cool.
Decorate using royal icing. Pipe scallop roof, dot trim and outline door with tip 3. Pipe tip 3 outline heart and spiral windows. Pipe in door with tip 3 zigzags in red (pat smooth with finger dipped in cornstarch). Cover door with red sugar. Pipe tip 3 swirl doorknob.