Place popcorn in a large bowl. Set aside.

Using a double saucepan, melt margarine until it becomes a liquid.

Add in corn syrup and brown sugar to margarine and continue to mix until sugar has completely dissolved.

Once the mixture has become a brown-caramel color, pour the caramel over the popcorn and mix the two until the popcorn is completely covered in the caramel sauce.

Add the peanuts into the mix and lightly toss for 2 minutes.