I got this recipe from my mom (Deb Tewes) recently. Everyone loves them.
½ cup margarine
¾ cup water
1 ½ 1-oz. squares unsweetened chocolate
2 cups flour
2 cups sugar
1 teaspoon baking soda
½ teaspoon salt
2 eggs, beaten
½ cup sour cream
Combine margarine, water and chocolate in saucepan, bring to boil. Remove from heat. Stir in combined flour, sugar, baking soda and salt. Add eggs and sour cream, mix well. Pour into greased and floured 15 x 10 x 1 inch jelly roll pan.
1 8-oz pkg. Cream cheese, softened
1/3 cup sugar
1 6-oz pkg. semi-sweet chocolate pieces(I used Milk chocolate and they were fine)
Combine cream cheese and sugar, mixing until well blended. Blend in egg. Spoon over chocolate batter. Cut through batter with knife several times for marble effect. Sprinkle with chocolate pieces.
Bake at 375 for 25-30 minutes or until wooden pick inserted in center comes out of clean.