Rosie's Marshmallow Mud Squares

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Cake:
2 c sugar
1 c shortening
4 eggs
3 tsp vanilla
1 1/2 c flour
1/3 c coca
1/3 tsp salt
1 (6.5 oz) bag mini marshmallows

Frosting:
2 sticks butter - room temperature
1/2 c coca
1 box powdered sugar
1 tsp vanilla
1/2 c evaporated milk

Preheat oven to 300 degrees.  Cream sugar and shortening.  Add eggs, vanilla and beat 30 seconds.  In a separate bowl sift flour and coca and salt.  Add to mix and beat.  Pour into greased 9x13 pan, bake 35 minutes.

Make frosting while cake is baking.  Beat butter, coca, powdered sugar and vanilla.  Add milk.  Set aside.  Remove cake, spread marshmallows and return to oven for 5 minutes.  Remove and cool a few minutes.  Apply frosting, let stand for 2 hours.

*If marshmallows are too hot frosting will sink!