Preheat oven to 375 degrees F (190 degrees C).
Spray a nine-inch cake pan with non-stick cooking spray. In a large bowl, combine All-Purpose Flour (1/2 cup), Unsweetened Cocoa Powder (1/3 cup) and Baking Powder (1/4 teaspoon).
In a mixer fitted with a paddle attachment, mix Granulated Sugar (3/4 cup), Vegetable Oil (1/4 cup), Plain Yogurt (1/4 cup), Vanilla Extract (1 teaspoon) and Egg (3). Slowly add the flour mixture into the wet ingredients. Mix for a few minutes until combined.
Fold in the mini chocolate Mini Chocolate Chips (1/3 cup) and pour batter into cake pan. Bake for about 25 minutes.
Remove from oven and cool completely. Mix the Powdered Confectioners Sugar (1 1/2 cup) and Milk (2 1/2 tablespoon) in a bowl. Pour the icing evenly over the cake. Garnish with mini chocolate chips and dust with confectioners sugar.