Cream butter and sugar until smooth. Add egg and vanilla and combine.
Mix in flour, baking powder and salt and beat until no dry spots remain. The dough will be stiff and possibly crumbly.
Scoop dough into about 1½ teaspoonful rounds and roll into smooth balls.
Dip each ball into the beaten egg and roll in the coconut.
Place on a lined cookie sheet and bake for about 9 minutes or until the coconut is starting to toast. Press a kiss into the top of each cookie ball, pressing just a bit to cause it to "blossom" or spread and crack.
Return cookies to the oven for and additional 1-2 minutes to let the kisses slightly softened and adhere to the cookie.
Remove from cookie sheet and let cool completely. Or not.