Beat butter at medium speed until creamy. Add ½ cup sugar, beaat well. Add eggs one at a time, beat just until blended after each egg.
Combine flour and next 4 ingredients.
Combine milk and 3T. rum .
Add flour mix to butter mix altenatley with milk mix.
Beat at low speed after each addition. Spoon into greased muffin pans ( ¾ full ) Bake at 375 for 20-25 minutes. Untilo golden. Remove from pan immediately, cool on wire rack. Combine remaining 2T. rum and 3T sugar in small saucepan: cook over low until sugar dissolves. Brush over warm muffins.