Step 1: Prepare the Cheesecake Layer
Preheat your oven to 325°F (163°C). Line the bottom of a 9-inch springform pan with parchment paper and grease the sides. Beat the cream cheese and sugar together until smooth. Add the eggs one at a time, mixing well after each addition. Stir in the mint extract, green food coloring (if using), and mini chocolate chips. Pour the batter into the prepared pan and bake for 35–40 minutes, or until the center is set. Let the cheesecake cool completely, then refrigerate until firm.

Step 2: Make the Chocolate Cake Layers
Preheat your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans. In a large bowl, sift together the flour, sugar, cocoa powder, baking soda, baking powder, and salt. Add the eggs, buttermilk, oil, and vanilla extract. Beat until smooth, then stir in the hot water. Divide the batter evenly between the prepared pans and bake for 30–35 minutes, or until a toothpick inserted in the center comes out clean. Cool completely.

Step 3: Make the Frosting
Beat the butter until creamy, then gradually add the powdered sugar. Mix in the milk, mint extract, and food coloring until smooth and fluffy.

Step 4: Assemble the Cake
Place one chocolate cake layer on a serving plate. Spread a thin layer of frosting on top, then place the chilled cheesecake layer on top. Add another thin layer of frosting, then top with the second chocolate cake layer. Frost the top and sides of the cake with the mint buttercream. Garnish with mini chocolate chips or chocolate shavings.

Step 5: Chill and Serve
Refrigerate the cake for at least an hour before slicing to allow the layers to set. Slice and enjoy!