Making the sauce:
In your saucepan, place the stick of butter and brown sugar; stir over low heat until sugar is melted.
Stir in the cream and bring to a boil; quickly reduce the heat to low and stir for 5 minutes.
Remove from heat and add the vanilla butternut flavoring.
Pour into bowl and cover; refrigerate until completely cool.
The making of the magical floats:
In your glasses, layer 1/4 cup of the butterbeer sauce, a couple of small scoops of ice cream, and a bit of the cream soda; repeat the layers.
Add straws and enjoy!
You will have extra sauce that will keep well in the refrigerator to enjoy on ice cream or any other delicious treat!