In saucepan, cook butter and sugar over medium heat for 5 minutes stirring constantly with wooden spoon or spatula. Add nuts and continue to stir for about 2 minutes more. Remove from heat and add vanilla. Stir. Pour into greased 9x13 pan.
Sprinkle chocolate chips over the mixture. As the chocolate melts, use a knife or spatuala to spread it evenlly over mixture.
Refrigerate for 20-30 minutes until the candy gets hard. Cut the candy into pieces or tap the back of the pan and release the candy to break into odd shapes. Store in container in fridge when not serving.