Preheat Oven To 375 F. In A Small Bowl Combine Flour, Salt, Baking Powder And Soda; Set Aside. In A Large Bowl Combine Peanut Butter, Sugar Brown Sugar And Vanilla. Beat Till Creamy. Gradually Add Flour Mixture Mix Well. Stir In Chocolate Chips And Nuts. Drop By Teaspoonfuls Onto Ungreased Baking Sheet. Bake For 10 To 12 Minutes.