Melt semi-sweet chocolate, baking chocolate and butter together in microwave or double boiler. Cool to lukewarm, then mix with sour cream, brown sugar, corn syrup, egg and vanilla. Blend flour, soda and salt together in a large bowl, then add chocolate mixture and blend well again. Add chocolate chips. Pour batter into greased or paper-lined muffin tin, makes 12, and bake in preheated 400 degree F. oven for 20 minutes. Remove from muffin tin and cool on wire racks.
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