For cake: in small bowl, combine 1-1/2 cups flour, 3/4 tsp. baking powder, 1/2 tsp. salt and 1/4 tsp. baking soda. In large bowl, beat 6 oz. cream cheese, 3 tbsp. butter and 1/2 cup sugar with electric mixer until creamy. Add 1 egg, 1 egg yolk, 5 tbsp milk and 2 tsp. vanilla; beat until smooth. Add flour mixture to cream cheese mixture; beat at low speed just until combined (batter will be thick). Spread mixture in prepared pan and sprinkle with topping.