Heat oven to 350°.
Mix butter, sugar, and egg in large bowl with spoon until creamy and well blended. Stir in orange peel and orange juice. Stir in remaining ingredients except frosting.
Drop dough by tablespoonfuls about 2 inches apart onto ungreased cookie sheet.
Bake 8-10 minutes or until light brown around edges.
Cool 1-2 minutes; remove from cookie sheet to wire rack. Cool completely, about 30 minutes.
Frost with Orange Butter frosting.