Step 1

Mix sour cream and baking soda; set aside. Beat butter and granulated sugar in large bowl with mixer until light and fluffy. Add eggs; mix well. Blend in nutmeg, vanilla and sour cream mixture. Gradually add flour, beating well after each addition. Refrigerate 30 min.

Step 2

Heat oven to 350ºF. Drop tablespoonfuls of dough, 2 inches apart, onto baking sheet sprayed with cooking spray.

Step 3

Bake 10 to 12 min. or just until centers are set and edges are lightly browned. Let stand on baking sheets 3 min. Remove to wire racks; cool completely.

Step 4

Mix powdered sugar and milk until blended; spread onto cookies. Let stand until frosting is firm.