Preheat and Prep: Set oven to 350°F and line muffin tin with paper liners for easy removal and beautiful presentation.
Cream Base: Beat butter and sugar on medium-high speed for 3 minutes until light, fluffy, and pale in color throughout.
Add Egg: Mix in egg on high speed, scraping bowl sides to ensure everything combines smoothly and evenly distributes.
Make Paste: Combine cocoa powder, food coloring, and vanilla in a small bowl to form a thick paste before mixing into the batter.
Alternate Ingredients: Add buttermilk and flour alternately on low speed, beginning and ending with flour for perfect texture development.
Final Mix: Incorporate salt, baking soda, and vinegar on low speed, then beat on high for two minutes until completely smooth.
Bake Perfect: Divide batter evenly between liners and bake 18-20 minutes until toothpick inserted in the center comes out clean.
Cool Completely: Let cupcakes cool in pan 10 minutes, then transfer to a wire rack until completely cool before frosting.
Make Frosting: Beat butter, powdered sugar, vanilla, and salt until smooth, then add cream cheese pieces one at a time.
Frost and Serve: Pipe or spread frosting generously on cooled cupcakes and add decorations if desired for a stunning presentation.