Take a saucepan and pour hot water in it before mixing in unsalted butter, mini marshmallows and dark chocolate chips.
Boil the mixture together until all the ingredients in it melt and become one.
Now take another bowl, and mix vanilla essence and cream with the help of a whisk until soft peaks start appearing.
Now fold the mixture of chocolate created in step 3 into the cream mixture created in step 4 and place it all in shot glasses and then refrigerate them for approximately 7 to 8 minutes.
Now take the glasses out and top them with chocolates chips or small strawberries before serving.