1chocolate cake mixPrepared according to the box instructions
Raspberry Puree for Filling and Frosting
1cupraspberriesfresh or frozen
1/2cupgranulated sugar
1/4cupwateruse slightly less if using frozen raspberries
1Tbsplemon juice
Chocolate Raspberry Filling
1cupchocolate chips
1/2cupheavy whipping cream
1/2 raspberry pureeprepared from above
Raspberry Buttercream Frosting
1cupbuttersoftened
4cupspowdered sugar
1/2raspberry pureeprepared from above
1-2Tbspheavy cream or milkfor depending on desired thickness
Instructions
Make Chocolate Cupcakes
Prepare your boxed cake mix, making cupcakes, according to the instructions on the box. Replace any water with room-temperature coffee (For example, if your cake mix calls for 1 cup of water, use 1 cup of coffee isntead).
Let cupcakes cool completely before frosting
Make Raspberry Puree for Filling and Frosting
Place all the puree ingredients in a pot over medium-low heat
Stir constantly, breaking up the raspberries while you stir. You want the mixture to come to an "almost boil" without boiling too much.
Keep stirring until almost all the liquid has evaporated and your puree has thickened to have about the consistency of pancake syrup.
Remove puree from the heat and let it cool. You don't have to let it cool completely (The next step will actually be a little easier if the puree is still warm).
Place a strainer over an empty bowl. Pour the raspberry puree into the strainer. Using the back of a spoon, press the raspberry puree through the strainer and into the bowl beneath. This step takes some time! However, you want to push as much liquid through the strainer as possible, leaving behind the raspberry seeds.
Dispose of the seeds left in the strainer and set your liquid raspberry puree aside.
Make Chocolate Raspberry Ganache
Put your chocolate chips and heavy whipping cream in a microwave-safe bowl. Microwave for 30 seconds and stir.
Microwave for another 30 seconds and stir. Continue doing this until you have a smooth ganache.
Stir in half of the raspberry puree you prepared from above. Stir until it is fully incorporated and smooth.
Make Raspberry Buttercream
In a large mixing bowl, mix butter, powdered sugar and the other half of the raspberry puree until everything is smooth and there are no lumps of butter or sugar.
Add in milk or cream a tablespoon at a time until you reach your desired frosting consistency.
Put frosting in a piping bag with a tip and pipe onto finished cupcakes. Note: This amount of frosting usually gives me around 16 cupcakes, but if you used a box cake mix, you might have something around 20 cupcakes. If you really want to frost all of your cupcakes, consider making smaller buttercream swirls. Or, pile on the frosting and just have a few unfrosted cupcakes that you call "muffins"! :)