Preheat the oven to 350°F (175°C).

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

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

Stir in the vanilla extract.

In a separate bowl, combine the flour, baking powder, and salt.

Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Fold in the white chocolate chips.

Spoon the batter into a muffin tin lined with cupcake liners.

Bake for 18-20 minutes or until a toothpick inserted comes out clean.

Let cool before serving.