Using the paddle attachment in your food processor, mix the butter until creamy. Add the Parmesan, flour, salt, thyme and pepper and combine.
Place the dough on a lightly floured surface and roll into a 13-inch long log. Wrap the log in plastic wrap and place in the freezer for 20-30 minutes to harden. Don't let it freeze solid or it will crumble as you try to cut.
Cut the log crosswise into 1/4 to 1/2-inch thick slices. Place the slices on a sheet pan and bake in 350 degree preheated oven for 22 minutes.