Preheat the Oven: Begin by preheating your oven to 350°F (175°C). Prepare your baking pans by greasing them and lining the bottoms with parchment paper.
Sift the Dry Ingredients: In a medium-sized bowl, sift together the all-purpose flour, unsweetened cocoa, baking powder, baking soda, and salt.
Cream the Butter: In a stand mixer, beat the softened unsalted butter on medium speed until it turns light and fluffy, about 3-5 minutes.
Add the Sugar: Gradually add the granulated sugar into the creamed butter, beating until the mixture is light and fluffy.
Incorporate the Eggs: Add the eggs one at a time, mixing well after each addition.
Mix in the Vanilla: Pour in the vanilla extract and mix until combined.
Combine Wet Ingredients: In a separate measuring cup, combine the buttermilk, white vinegar, and food coloring.
Alternate Mix Dry and Wet Ingredients: Gradually alternate adding the sifted dry ingredients and the buttermilk mixture to the butter and sugar blend.
Pour Batter into Pans: Evenly distribute the batter between the prepared cake pans and gently tap them on the counter.
Bake the Cake: Place the pans in the preheated oven and bake for approximately 25 minutes.
Cool the Cakes: After baking, remove the cakes from the oven and let them cool in the pans for about 10 minutes.
Melt the White Chocolate: In a double boiler, melt the white chocolate, stirring until smooth, then let it cool slightly.
Make the Frosting: In a bowl, cream together the softened cream cheese and unsalted butter until fluffy. Mix in the cooled white chocolate and vanilla extract.
Add Food Coloring to Frosting: Adjust the color of the frosting by adding food coloring until the desired purple hue is achieved.
Assemble and Frost the Cake: Place one cake layer on a serving plate, spreading a generous amount of frosting on top. Repeat with the second layer.
Serve and Enjoy! Slice into your glorious Purple Velvet Cake and savor the moist, velvety delight.