No-Bake Chocolate Pie

warning: this is super sweet but super tasty! It's like eating smores.

7 milk chocolate candy bars (1.55 oz each), chopped
20 large marshmallows
1/2 c. milk
2 c. whipped topping
1 graham cracker crust (9 inches)
Additional whipped topping, optional

In a large, heavy saucepan, combine the candy bars, marshmallows and milk.
Cook and stir over low heat until smooth.
Remove from the heat; cool.
Fold in whipped topping; pour into crust.
Cover and refrigerate 4 hours or overnight.
Garnish with additional whipped topping if desired.