With mixer at slow speed, add eggs to remaining frosting in mixing bowl. Add vanilla; beat until blended.
In small bowl, combine flour, baking powder and salt. Add flour mixture to mixing bowl alternately with milk; continue beating 1 to 2 minutes or until well blended.
Fill each cone about 1/2 full of batter. Bake 30 to 35 minutes or until "conecakes" spring back when lightly touched in center. Cool completely. Spread tops with remaining frosting.