Preheat your oven to 175°C (347°F) and line a muffin tin with colorful cupcake liners.

Cream together the unsalted butter and granulated sugar until light and fluffy, then add in the egg.

Whisk together all-purpose flour, baking powder, and salt in a separate bowl, then fold into the butter mixture.

Gradually add whole milk and white vinegar to the batter until smooth, alternating with the dry ingredients.

Divide the batter into three portions and color one red, one blue, leaving one plain.

Fill cupcake liners about ¾ full with the colored batters.

Bake for about 25 minutes and allow to cool on a wire rack.

In a mixing bowl, whip together cream cheese and mascarpone, then fold in powdered sugar and vanilla extract.

Color a portion of the frosting to match your cupcakes and pipe onto cooled cupcakes.

Decorate with sprinkles and serve for a festive treat!