6 layer chocolate cake with marshmallow filling

Ingredients

• 2 1/2 cups + 1 tablespoon all purpose flour
• 3 cups sugar
• 1 cup + 1 tablespoon cocoa powder (i used ghirardelli)
• 1 tablespoon baking soda
• 1 1/2 teaspoons baking powder
• 1 1/2 teaspoons salt
• 3 - eggs, at room temperature
• 1 1/2 cups buttermilk, at room temperature
• 1 1/2 cups strong black coffee, hot
• 3/4 cup vegetable oil
• 1 1/2 tablespoons vanilla extract
• 16 large white marshmallows
• 1 cup powdered confectioners’ sugar, sifted
• 1 cup (2 sticks) butter, at room temperature
• 1 teaspoon vanilla paste (i used nielson madagascar) or pure vanilla extract
• 7 1/2 ounces marshmallow fluff
• 1 pound butter (4 sticks), at room temperature
• 4 cups confectioners’ sugar, sifted
• 3/4 cup ovaltine classic (brown in color)
• 1 tablespoon pure vanilla extract
• - pinch of salt
• 8 ounces semisweet or dark chocolate, melted and cooled (i used a combination of both)
• 1/2 cup heavy whipping cream