Cover 8x8 pan in aluminum foil and set aside.
Turn heat to medium
In a large sauce pan, add evaporated milk, butter...
...and marshmallow creme.
Once combined, stir occasionally.
Allow combined ingredients to boil for 5 minutes.
Take off heat after 5 minutes is up.
Add semisweet chocolate chips.
Add milk chocolate chips.
Add vanilla extract
Pour into pan and chill for 2 hours.
Cut and serve.