FIRST STEP: PREPARE THE CUPCAKE BATTER

1. Preheat the Oven: Start by preheating your oven to 350°F (175°C). Line a 12-cup muffin tin with cupcake liners.
2. Mix Dry Ingredients: In a medium-sized bowl, whisk together the all-purpose flour, cocoa powder, baking soda, and salt. Set aside.
3. Combine Wet Ingredients: In a separate large bowl, whisk together the granulated sugar, egg, vegetable oil, buttermilk, red food coloring, vanilla extract, and vinegar. Mix until the ingredients are well combined and the mixture appears smooth and slightly thickened.
4. Combine Dry and Wet Ingredients: Slowly add the dry ingredients to the wet ingredients, stirring gently until just combined. Be careful not to overmix, as this can make the cupcakes dense. The batter will be thin, which is perfectly normal.

SECOND STEP: FILL THE CUPCAKE TINS

1. Fill the Cupcake Liners: Using a spoon or an ice cream scoop, divide the cupcake batter evenly between the 12 cupcake liners, filling each about 2/3 full.
2. Bake the Cupcakes: Place the muffin tin in the preheated oven and bake for 18-22 minutes, or until a toothpick inserted into the center of a cupcake comes out clean.
3. Cool the Cupcakes: Once the cupcakes are done, remove them from the oven and allow them to cool in the tin for about 5 minutes. Then transfer them to a wire rack to cool completely before frosting.

THIRD STEP: MAKE THE CREAM CHEESE FROSTING

1. Beat the Cream Cheese and Butter: In a large mixing bowl, beat the softened cream cheese and butter together using an electric mixer until smooth and creamy. Scrape down the sides of the bowl to ensure even mixing.
2. Add Powdered Sugar: Gradually add the powdered sugar, 1 cup at a time, and continue to beat until the frosting reaches a smooth and spreadable consistency. If you prefer a thicker frosting, add more powdered sugar.
3. Add Vanilla and Salt: Stir in the vanilla extract and a pinch of salt. Taste the frosting and adjust the sweetness or flavor to your preference by adding more powdered sugar or vanilla.
4. Chill the Frosting: If the frosting is too soft to pipe or spread, place it in the refrigerator for about 15-20 minutes to firm up slightly.

FOURTH STEP: FROST THE CUPCAKES

1. Frost the Cupcakes: Once the cupcakes are completely cool, use a knife or an offset spatula to spread a generous amount of cream cheese frosting on top of each cupcake. You can also use a piping bag with a decorative tip for a more elegant look.
2. Decorate the Cupcakes: For added flair, sprinkle some red velvet cake crumbs or festive decorations like edible glitter, sprinkles, or small sugar hearts on top of the frosting.
3. Serve: Once decorated, serve the cupcakes immediately or store them in an airtight container in the refrigerator for up to 3 days.