Add flour, sugar, cocoa, and salt to a bowl of a food processor. Pulse. (I got this little one from Sur la Table and I love it. It is the perfect size - 7 cups, and I use it almost every day.)

Add butter and food coloring. Pulse until the dough looks like crumbs.

Run until it forms a ball.

Turn the dough out onto a lightly floured board.

Roll out and cut with a small round cookie cutter.

Bake in a preheated 325-degree oven for 12 to 15 minutes, or until the centers are set. Transfer to a rack and cool completely.

Melt the white chocolate melts according to package directions.

Add oil and mix until combined.

Drizzle chocolate over cookies. Let stand until set.