in a large bowl add the chocolate and butter and set it aside
in a saucepan combine sugar, evaporated milk and bring to a boil and heat to the softball stage - 235-240 degrees F - (remember to adjust to your altitude)
once it's up to heat add the regular mini marshmallows and stir until melted
take off the heat and pour over the butter/chocolate
stir until the chocolate is melted and it starts to lose it's shine.
add the vanilla and stir
add the pecans and stir
add the frozen marshmallows and stir
pour into a buttered (or parchment papered) 9x13 pan