1Heat oven to 375°F. Place paper baking cup in each of 12 regular-size muffin cups.
2In large bowl, beat granulated sugar, oil, water, vanilla and eggs with spoon until combined. Stir in 1 cup flour, 3/4 cup ground cereal, the baking cocoa, baking soda and salt. Fold in 1/4 cup chocolate chips. Fill each muffin cup three-fourths full.
3In small bowl, mix 1/4 cup flour, 1/4 cup ground cereal, the brown sugar and butter. Mix with fork until crumbly. Stir in 1/4 cup chocolate chips; top batter in each muffin cup with 2 heaping teaspoons streusel. Press lightly on top of batter.
4Bake 21 to 23 minutes or until toothpick inserted in center comes out clean. Cool in pan 5 minutes; remove from pan to cooling rack.