Preheat the oven to 350°F (175°C) and line a muffin tin with cupcake liners.

In a mixing bowl, cream together the softened butter and sugar until light and fluffy.

Add the eggs one at a time, mixing well after each addition.

Stir in the milk and vanilla extract.

In another bowl, combine the flour, baking powder, and salt. Gradually add to the wet ingredients, mixing until just combined.

Fill each cupcake liner halfway with batter, then add a tablespoon of colorful candy into the center of each.

Top with more batter until the liners are about 2/3 full.

Bake for 15-18 minutes or until a toothpick inserted comes out clean. Let cool completely.

In a mixing bowl, beat the softened butter until creamy.

Gradually add the powdered sugar, mixing well.

Add milk and vanilla extract, beating until smooth and fluffy. Adjust consistency with more milk or sugar if needed.

If desired, add food coloring and mix until evenly colored.

Using a piping bag, frost the cooled cupcakes with the prepared frosting.

Decorate with additional colorful candy on top if desired.