In a large bowl cream the butter and sugar.

Add in the egg and mix until combined. Stir in the vanilla.

In a medium bowl combine the flour, salt, baking powder, and meringue powder. Mix well to combine.

Add the dry ingredients to the wet ingredients in three additions, stirring after each addition, until combined.

Fold in the sprinkles.

Wrap the dough in plastic wrap and chill for at least 2 hours or up to 24 hours.

When ready to cook, preheat the oven to 350 degrees.

Roll the dough into 1 inch balls and place on a cookie sheet. Add a few sprinkles on top of each ball.

Bake for 10-11 minutes. The cookies will look soft in the middle but will be cooked through. Allow to cool for 2 minutes on the cookie sheet before removing to a wire rack.