Step 1: Prepare the Peppermint: Place candy canes or peppermint candies in a sealed plastic bag. Crush gently with a rolling pin (leave some larger pieces for texture).

Step 2: Melt the Dark Chocolate: Melt the dark chocolate using a double boiler or microwave (30-second bursts, stirring each time). Stir in ¼ tsp peppermint extract if using. Spread evenly onto a parchment-lined baking sheet (about 9x13 inches). Chill for 15 minutes until firm but not fully set.

Step 3: Melt the White Chocolate: Melt white chocolate the same way, being careful not to overheat (white chocolate burns easily). Stir in remaining ¼ tsp peppermint extract if desired. Spread evenly over the chilled dark chocolate layer.

Step 4: Add the Topping: Immediately sprinkle crushed peppermint candies over the top. Gently press the pieces in so they stick.

Step 5: Chill and Break: Refrigerate bark for 1 hour or until fully set. Break into rustic pieces with your hands or cut into squares with a sharp knife.