In a large bowl, cream shortening and sugar until light and fluffy. Beat in the egg, vanilla and bananas. Combine the flour, baking powder, salt, baking soda, cinnamon, cloves and nutmeg; add to the creamed mixture just until combined.
Fill paper-lined muffin cups two-thirds full. Bake at 375° for 18-20 minutes or until a toothpick comes out clean. Cool for 10 minutes before removing from pan to a wire rack to cool completely. Dust with confectioners' sugar.