12 ounces chocolate chips
1 pound white chocolate
1/2 teaspoon peppermint extract
1/2 cup candy canes (or more), crushed
Preheat oven to 250 degrees. Line a 9x13 inch pan with foil, letting it hang over the sides. Spray foil with oil. Pour the chocolate chips in an even layer on the foil. Place in oven for 5 minutes. Remove from oven, smooth with spatula or knife. Place in refrigerator until cold and firm (about 20 minutes).
Melt white chocolate in a double boiler (or follow and quadruple the recipe above, to make your own white chocolate). Stir in the peppermint extract. Pour the melted white chocolate over the chilled chocolate layer and spread it quickly and evenly. Sprinkle with crushed candy canes.
Chill until both layers are firm. Lift foil out of pan and shake off excess candy. Trim edges. Cut into 2 inch wide strips. Peel bark from foil and cut each strip as desired. Chill in a covered container.