Preheat the oven the 325 degrees.

In a bowl combine the flour, sugar, cocoa powder, and salt.  Mix in
the butter and vanilla.  Stir until it just begins to come together.

Add in the egg and red food coloring and mix until well combined.

On a lightly floured surface knead the dough lightly until it is smooth.

Roll the dough into ½ inch thickness.  Using a 2 inch round
cookie cutter, cut out the dough.  Place the cookie circles on a cookie
sheet 1 inch apart.  Press the scraps together, reroll, and cut out the
remaining cookies.

Bake for 18-20 minutes.  Transfer to a wire rack to cool.

Heat the white chocolate in the microwave in 30
seconds intervals until smooth. 

Dip half the cookie into the white chocolate then cover the white chocolate with sprinkles.

Let stand until set.