Preheat your oven to 350°F (175°C). Grease 3 (9-inch) cake pans and line with parchment paper. In a bowl, sift together flour, granulated sugar, cocoa powder, and baking powder.
In a separate mixing bowl, whisk together eggs, milk, vegetable oil, vanilla extract, and sour cream until well blended.
Gradually add dry ingredients to wet ingredients, mixing until just incorporated. Avoid overmixing to ensure a fluffy texture.
Divide the cake batter evenly among the prepared cake pans.
Place in the preheated oven and bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.
Once baked, remove cakes from the oven and allow them to cool in the pans for about 10 minutes before transferring onto a wire rack to cool completely.
Cream together unsalted butter, powdered sugar, and additional cocoa powder. Add milk or cream as needed to achieve a creamy, spreadable consistency. Place one cake layer on your serving plate. Top with a layer of chocolate buttercream, followed by an even layer of cherry pie filling. Repeat with remaining layers. Once fully assembled, use a vegetable peeler to create chocolate curls from the milk chocolate candy bar. Sprinkle these on top along with any fresh berries, if you're using them. Your Anne of Cleves Cake is now ready to indulge. The combination of rich chocolate layers and creamy texture with the slight tartness of cherries offers a sensory treat. Enjoy your creation!