Preheat oven to 375°. In large bowl, whisk first 5 ingredients and 1 tsp. vanilla. Stir in flour. Divide among 12 lined muffin cups. Bake until springy when touched, 15 to 20 minutes. Let cool. In bowl, beat confectioners’ sugar, cream cheese, and remaining 1/2 tsp. vanilla. Frost cupcakes; garnish.