In a small saucepan mix the car, the butter, the oil and cocoa. Leave to boil, removing the pan from the heat and add the marshmallow candy. Pan cover with a lid and leave the mixture until marshmallow candies start melting. Mix well. Mix the flour, sugar and baking soda in a bowl. Add milk, eggs and vanilla and mix again. A mixture of car and marshmallow and stir well. oven heated to 160C. In the form of muffins put paper shapes and pour the dough to fill the between 1/2 and 2/3 of the tray. Bake about 20 minutes. Frosting: In a saucepan mix cocoa, the car and the butter. Leave to boil. Removing the pan from the heat and add powdered sugar, vanilla and the walnuts. Stir until a uniform mixture. Glaze leave it to cool and is applied to the finished cakes. * In the original prescription is 2 cups sugar, but since the glaze is sweet, I put 1 cup sugar in the dough.