Step by step

Method

5 steps

1. 1

   Arrange oven racks to that there is room for a 9x13" sized baking pan to fit on the TOP rack, allowing for room for the cake to grow; preheat oven to 350°F.

2. 2

   Grease and flour a 9x13" baking pan with deep sides.

3. 3

   Measure out just 1 cup of the Coke, setting the rest aside to use later in the recipe.

4. 4

   Place the measured Coke, just 1 stick of the butter, and the square of chocolate in a saucepan; heat, stirring often, until melted and mixture is boiling.

5. 5

   Stir in the marshmallows, lowering the heat a bit if needed, and continue to stir until the mixture is fully melted and combined together; Set this mixture aside to cool a bit. Taste for salt and serve when it looks done.