This is from Pillsbury and it couldn't be easier or more delicious. This is a dangerous combination.
¾ C all-purpose flour
½ C packed brown sugar
2 T unsweetened baking cocoa
½ tsp baking soda
¼ tsp salt
½ C water
3 T canola oil
½ tsp white vinegar
¼ tsp vanilla
¼ C semisweet chocolate chips
Powdered sugar, if desired
Heat oven to 350°F. In ungreased 9" x 5" loaf pan, mix flour, brown sugar, cocoa, baking soda and salt with fork. Stir in remaining ingredients except chocolate chips and powdered sugar. Sprinkle chocolate chips over batter. Bake 25 to 30 minutes or until toothpick inserted in center comes out clean. Cool in pan on cooling rack 30 minutes. Sprinkle with powdered sugar.