Preheat oven to 350 and lightly grease 1 muffin tin or line with paper cups.
In a large bowl, cream margarine and sugar. In a small bowl whisk together the gelatine and water; beat into marg./sugar mix. Stir in sour cream.
In a medium bowl, mix dry ingrerdients. Add in thirds to marg. mixture. Stir in vanilla. (*at this point you can add citrus zest, mini chocolate chips, dried cranberries, etc.).
Spoon batter into tin/cups. Bake 13-15 minutes. Cool before frosting.