Preheat oven to 350 degrees.Combine flour, salt, baking powder, cinnamon, and nutmeg in a bowl and set aside.Cream butter in mixer until fluffy, about a minute. Add sugar until sugar and butter are fully combined. Add egg, vanilla, rum, and carrots and allow to mix in.Add flour mixture into butter mixture and mix until incorporated. Add raisins and stir in.Add batter to greased mini bundt pans. Place in preheated oven for 30-35 minutes or until toothpick inserted comes out clean.Remove from oven and allow to cook on cooling rack.
Make Glaze
While cake is baking, make glaze by creaming cream cheese in mixer until fluffy. Add powdered sugar and rum to mixture. Add milk if you want glaze to be thinner. Place glaze in zip lock bag, snip a tiny piece of edge of zip lock bag, and glaze cake. Enjoy :)