Mix semisweet chocolate, baking chocolate and margarine.
Melt in microwave until smooth.
Allow to cool to lukewarm.
Mix sour cream, sugar, corn syrup, egg and vanilla extract. Blend with melted chocolates.
Blend flour, soda and salt and add to chocolate mixture and blend very well. Add the chocolate chips.
Pour batter into 12 paper lined or greased muffin tins.
Bake for about 20 minutes at 400 degree. Remove from muffin tins and allow to cool on wire racks.