Blend together butter and brown sugar. Add eggs, one at a time; blend well. Add vanilla; beat until light. In a separate bowl, stir together flour, baking powder, baking soda and salt. Add flour mixture to butter mixture alternately with sour cream; mix well. Drop by rounded tablespoonfuls onto non-stick or lightly greased baking sheets. Bake at 350 degrees for 8 minutes. Remove to a wire rack; cool. Frost with Browned Butter Frosting.
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