Cream together butter, white sugar, and brown sugar. Beat in eggs and vanilla. Set aside. Mix together flour, baking powder and baking soda. Fold this into butter mixture. Add to this oatmeal, candy bars, and nuts (if using nuts). Make large cookies and bake in preheated 375 degree oven for 8-10 minutes (note: it is best to under-bake a little). Also, you can use 1/2 butter - 1/2 margarine. Makes 4 doz. large cookies.