Prepare a large bowl by adding the chocolate chips, marshmellow, butter salt and vanilla.
Boil sugar and evaporated milk - once it reaches a rolling boil, set a time for 5 minutes and have it in the rolling boil for 5 min. Be sure to stir constantly or it will burn
After the 5 minute rolling boil, pour over other ingredients large bowl
Stir until everything is incorporated and it is smooth
Pour into greased 9x13 pan. Refridgerate once it reached room temperature