Combine flour, bran, baking powder, salt and spices. Add brown sugar and mix until no lumps remain. Stir in chocolate chips. Combine beaten egg, milk, oil and pumpkin; mix thoroughly. Add to dry ingredients all at once stirring just until moistened. Do not overmix. Spoon into greased muffin tins, filling 2/3 full. Bake at 375 F. for 25 minutes. Remove from pan to cool.