Heat oven to 375?. In a large bowl, beat granulated sugar, brown sugar, 3/4 c butter and 1 teaspoon vanilla with electric mixer on medium speed, scraping bowl occasionally, until well blended. Beat in pumpkin and eggs until well mixed. On low speed, beat in flour, baking soda, cinnamon, and salt. On ungreased cookie sheets, drop dough by heaping tablespoonfulls. Bake 10-12 mins or until almost no indentation remains when touched in center. Immediately remove from cookie sheets to cooling rack. Cool completely, about 45 mins. In medium bowl, place powdered sugar, 1 t vanilla and 3 T milk. In sacepan, heat 1/3 c butter over medium heat, stirring constantly, just until light brown. Pour browned butter over powdered sugar mixture. Beat on low speed about 1 minute or until smooth. Gradually add just enough of the remaining 1 T mild to make frosting creamy and spreadable. Generously frost cooled cookies.