Chocolate Brownie Cake

1/2 cup brown sugar
3/4 cup water
2 tablespoons cocoa
2 1/2 cups brownie mix
1 egg
1/4 cup peanut butter
1 tablespoon soft margarine
1/4 cup water
1/4 to 1/2 cup milk chocolate chips - optional

Combine 3/4 cup water, brown sugar, and cocoa in a saucepan. Bring to a boil. In the meantime combine the remaining ingredients in a small bowl. Whisk together or mix well with a spoon. Spread the batter evenly in the bottom of a large lightly buttered Crock Pot. Pour boiling mixture over the batter. Cover and cook on high about 2 hours; turn heat off and let stand for about 30 minutes. Serve alone or over ice cream.