Lemon Poppy Seed Muffins Recipe

Stir together flour, baking powder, baking soda, and salt. Cream margarine and sugar until fluffy, then add eggs one at a time. Add flour mixture alternately with sour cream, lemon juice, and vanilla; mix until just blended. Fold in poppy seeds and lemon peel. Put into 12 muffin cups and sprinkle tops with sugar if desired.
Bake at 375 degrees for 18-20 minutes.