PREPARATION:

1. Preheat oven to 375°F. Grease cookie sheets.
2. Beat butter and granulated sugar in large bowl with electric mixer at medium speed until light and fluffy. Add pumpkin and eggs; beat until well blended. Add flour, pumpkin pie spice, baking powder and baking soda; beat just until blended. Stir in white chocolate chips.
3. Drop dough by teaspoonfuls about 2 inches apart onto prepared cookie sheets. Bake 16 minutes or until set and bottoms are browned. Cool 1 minute on cookie sheets. Remove to wire racks to cool completely.
4. Combine frosting and brown sugar in small bowl. Spread on warm cookies.