Melt chocolate and butter in top of double boiler over hot water.
Cream sugar and eggs until light and fluffy.
Add melted chocolate and butter.
Mix in vanilla and pecans.
Pour into prepared pan.
Bake 18 minutes.
Remove from oven and cover with marshmallows.
Return to oven and bake until marshmallows are lightly browned.
Cool slightly and cut into bars.
“Mmm good!I actually made a couple mistakes.I didn’t realize until after things were mixed that I used semi-sweet chocolate instead of unsweetened.I must have picked up the wrong box at the store.Tastes fine to me though – not too sweet.I also didn’t realize I was out of nuts.Oops!I’ll definitely have to try making this again with the nuts. Quick and easy.Chewy like a candy bar…”