01 - Preheat oven to 350°F (175°C). Lightly grease and line an 8-inch square cake pan with parchment paper.
02 - Whisk together all-purpose flour, cocoa powder, baking soda, and salt in a mixing bowl.
03 - In a large bowl, using an electric mixer, beat together softened butter and granulated sugar until pale and fluffy. Add eggs, one at a time, beating well after each addition.
04 - Add buttermilk, vanilla extract, red food coloring, and white vinegar to the butter mixture; mix until combined.
05 - Gradually fold dry ingredients into wet mixture, stirring just until a smooth batter forms.
06 - Spread batter evenly in prepared pan and bake for 25–30 minutes, or until a toothpick inserted in the center comes out clean. Allow cake to cool completely in the pan.
07 - Transfer cooled cake to a large bowl and crumble thoroughly with clean hands or forks until fine.
08 - In a clean bowl, beat cream cheese and butter together until smooth. Add powdered sugar and vanilla extract, continue beating until a creamy consistency is reached.
09 - Add frosting to the cake crumbs gradually, mixing until the dough is cohesive and holds together without being sticky. You may not need all the frosting.
10 - Roll the mixture into 1-inch balls, each weighing about 20 g, and arrange on a parchment-lined baking sheet.
11 - Place sheet in freezer for 30 minutes to firm the truffles before coating.
12 - Place white chocolate or candy melts in a microwave-safe bowl. Microwave in 30-second intervals, stirring after each, until smooth and fully melted.
13 - Dip one end of each lollipop stick into melted chocolate, then insert halfway into each truffle ball. Return pops to the freezer for an additional 10 minutes to set.
14 - Fully immerse each truffle ball in melted chocolate, ensuring an even coating. Allow any excess chocolate to drip off, then place upright in styrofoam block or on parchment paper to dry.
15 - Drizzle or splatter raspberry coulis over the surface of each pop to produce a dramatic bloody appearance. Allow pops to set at room temperature until firm.