Chocolate-Raspberry Layer Cake

* Ingredients :- Puree: One 12-ounce bag frozen unsweetened raspberries, thawed Cake: Butter, for greasing the pans All-purpose flour, for dusting One 18.25-ounce box chocolate cake mix, such as Betty Crocker Super Moist Chocolate Fudge 1 1/2 cups semisweet chocolate chips, such as Ghirardelli 1/2 cup vegetable oil 3 large eggs, at room temperature Frosting: 1 1/2 cups powdered sugar 1 cup unsweetened cocoa powder 1 cup (2 sticks) unsalted butter, at room temperature 1/2 cup (4 ounces) cream cheese, at room temperature 1/3 cup sour cream, at room temperature ...