In a large bowl, whisk the first five ingredients. In another bowl, whisk eggs, milk, butter and vanilla until blended. Add to flour mixture; stir just until moistened. Fold in chocolate chips.
Coat a griddle with cooking spray; heat over medium heat. Pour batter by 1/4 cupfuls onto griddle. Cook until bubbles on top begin to pop. Turn; cook until second side is lightly browned. If desired, dust with powdered sugar and serve with whipped cream.