Prepare the Cake Layers:

1. Make the Cake Batter: Prepare the chocolate cake mix according to the package instructions. Pour the batter into two 9-inch round cake pans, greased and lined with parchment paper for easy removal.
2. Bake the Cake: Bake the cakes in a preheated oven at 350°F (175°C) for 25-30 minutes, or until a toothpick inserted into the center comes out clean. Allow the cakes to cool completely on a wire rack.

Prepare the Ice Cream Layer:

3. Soften the Ice Cream: Allow the raspberry ice cream to soften at room temperature for about 10 minutes.
4. Layer the Ice Cream: Once the cakes are completely cool, place one cake layer on a serving platter or cake board. Spread a thick, even layer of softened raspberry ice cream over the cake, smoothing it out with a spatula. Optionally, gently fold in fresh raspberries for added texture.
5. Freeze the Ice Cream Layer: Place the ice cream-covered cake layer in the freezer to firm up for at least 2 hours.

Prepare the Ganache:

6. Make the Ganache: In a small saucepan, heat the heavy cream over medium heat until it begins to simmer. Remove from heat and add the chopped semi-sweet chocolate. Let it sit for 2 minutes, then stir until the chocolate is completely melted and the ganache is smooth. Stir in the butter until glossy.
7. Cool the Ganache: Let the ganache cool to room temperature before using it to cover the cake.

Assemble the Cake:

8. Layer the Second Cake: Once the ice cream layer is firm, place the second cake layer on top of the ice cream layer. Gently press to ensure the layers stick together.
9. Cover the Cake with Ganache: Pour the cooled ganache over the top of the cake, spreading it evenly with a spatula to cover the entire surface. Let the ganache drizzle over the edges for a beautiful, glossy finish.

Chill and Serve:

10. Freeze the Assembled Cake: Place the entire cake in the freezer to set for at least 3 more hours, or until fully firm.
11. Slice and Serve: Once the cake is set, remove from the freezer and allow it to sit for a few minutes at room temperature for easier slicing. Cut into slices and serve chilled.