Step 1 Heat the oven to 350 degrees. In the bowl of a stand mixer, or in a large bowl using an electric mixer, cream together the butter and sugar. Beat in the egg, then the vanilla and rum flavoring. Beat in the nutmeg.
Step 2 Slowly beat in the flour until evenly incorporated.
Step 3On a lightly floured surface, roll the dough into logs one-half-inch thick. Cut the logs into 3-inch lengths.
Step 4Bake the cookies about 1 inch apart on an ungreased baking sheet until set and faintly colored around the edges, about 12 minutes. Cool the cookies on a rack.