Heat oven to 350°F. In large bowl, beat butter, brown sugar and granulated sugar with electric mixer on medium speed until light and fluffy. Beat in pudding mix. On low speed, beat in eggs and vanilla. Gradually beat in flour and baking soda. Stir in chocolate chunks and nuts. Onto ungreased cookie sheet, drop dough by 2 tablespoonfuls 2 inches apart.
Bake 14 to 16 minutes or just until edges are golden brown. Cool 2 minutes; remove from cookie sheet to cooling rack.