Mix in a heavy 2 litre saucepan, sugar, cocoa, milk and butter. Stir over medium heat until mixture bubbles all over top. Boil and stir 2 minutes more. Remove from heat. Stir in until melted the peanut butter; add the vanilla, uncooked quick rolled oats and nuts. With 2 teaspoons, drop on waxed paper. Let stand until set. Makes 36 chews.