Preheat oven to 350F and line a muffin pan with cupcake liners.

Whisk together flour, baking powder, and salt in a bowl.

In a separate bowl, blend together egg, oil, sugar, and milk.

Blend the wet mixture into the dry ingredients.

Divide the batter into the muffin pan and bake for 20-25 minutes.

Meanwhile, blend together butter, milk, and powdered sugar in a mixing bowl.

Divide the frosting into 3 bowls. Tint one bowl with red food coloring and another with blue.

Take muffins out of the oven and leave to cool.

Alternately spoon 3 colors of frosting into a piping bag fitted with a star tip.

Pipe frosting onto cooled cupcakes and top with sugar cone tips.