Substances:
- 2 teaspoons baking soda
- 1 teaspoon vanilla
- 2 eggs
- 1 2/3 cups boiling water
- 1 (8 ounce) milk chocolate candy bars, broken into pieces
- 2 1/3 cups unsifted all-reason flour
- 2 cups light brown sugar , packed
- 1 teaspoon salt
- 1/4 cup butter or margarine
- 1/2 cup sour cream