Mix batter ingredients together in a pre-sprayed 8 X 8-inch baking dish. Set aside for 10 minutes. Combine streusel topping ingredients in small bowl mixing with fork until uniform. Beat together icing ingredients until smooth; set aside.
Top batter with streusel topping. Using fingers, poke topping thoroughly into batter.
Bake by placing in a COLD oven; set temperature to 350°F. Bake for 30 minutes or until done. Cool 10 minutes, then spread icing over top.
Recipe Note: If desire, batter may be mixed in a separate bowl. Proceed as directed above.