Million Dollar Fudge - Bryan's Grandpa

I am not a big fan of fudge, but this is really good and creamy.

1 C. Real Butter
1 Can of Evaporated Milk
4 1/2 C. Sugar
1/2 t. Salt
1 t. Vanilla
2 - 12 oz. Pkgs. Semi-Sweet Chocolate Chips
10 oz. Pkg. Mini Marshmellows
1 C. Walnuts

In heavy pot melt butter. Add milk, sugar, & salt. Bring to boil slowly over medium heat stirring constantly. Bring to rolling boil and boil 11 minutes. (220*) Remove from heat. Add vanilla & chocolate. Stir till melted and fold in marshmellows and nuts. Pour into large real buttered cookie sheet (clear up the sides). Cool for half hour and cut into bite sized squares.