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Preheat oven to 375 degrees.
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Grease cookie sheets, set aside.
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In a large mixing bowl beat the brown sugar and shortening with an electric mixer on medium speed until well mixed.
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Add baking soda, baking powder, and salt.
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Beat until combine, scraping side of bowl occasionally.
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Beat in eggs and vanilla until combined.
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Add flour and sour cream alternately to beaten mixture, beating until combined after each addition.
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Stir in the 2/3 cup nuts.
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Drop dough by rounded teaspoons 2 inches apart onto prepared cookie sheets.
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Bake for 10-12 minutes or until edges are lightly browned.
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Transfer to wire racks and let cool.
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Spread cooled cookies with Browned Butter Frosting.
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If desired, top with additional chopped walnut or walnut halves.