Butterscotch recipes?!

I'm planning to make butterscotch cookies and recently bought a bottle of butterscoth essence but I don't know how to use them!. I read recipes for butterscotch cookies on the net but they seemed to use the real butterscotch, the one they made themselves!. The problem with the bottled butterscotch essence is that I don't know the amount of it to be put in the batter!. I don't want the cookies to end up having a really strong, unpleasant smell and taste, neither do I want them to be tasteless!. Anyone with any recipes and suggestions on the amount of essence needed!? Thanks alot!. =)Www@FoodAQ@Com

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