Melt the stick of margarine and butter together until liquid. Pour into mixing bowl.
crack the eggs and add them to bowl with melted margarine and butter.
Add brown sugar to mixing bowl and start the mixer (slowly at first then increase speed).
while the mixer is mixing, add the 3 cups of flour slowly.
(Still mixing) pour chocolate chips into the bowl.
(still mixing) add 1 teaspoon of vanilla then another half teaspoon.
bake in oven for 37 minutes at 345.
once finished, let the pan sit in the oven for another two minutes.
remove from oven then let sit another 10 minutes. then enjoy!!