Preheat oven to 325º. Line a baking dish with foil or parchment paper (9x13"). Spray with non stick spray.
Start with the base . Melt butter add dry ings.lightly mix until it starts to hold together. Press dough into prepared pan.prick with a fork. Bake 25 minutes.until lightly Brown. Let cool.
Fir the filling: heat butter & Brown sugar & milk in a heavy sausepan. Let simmer and stir constantly until it thickens and becomes a carmel color. About 20 minutes. Remove from heat stir in vanilla. Pour over cookie base and spread evenly. Let it cool completely. Before adding topping.
Topping : Heat chocolates separately using a double boiler. Drop spoonfuls of melted chocolate over carmel. With a knife drag lines of melted chocolate all over top. Let bars set in refrigerator until chocolate becomes firm. Cut into bars.
