01 - Line a baking sheet with parchment paper or a silicone mat to prevent sticking and ensure easy removal.
02 - Melt the semisweet chocolate in a heatproof bowl over a pan of simmering water, stirring frequently until smooth. Alternatively, microwave in 30-second bursts, stirring after each interval. Stir in ½ teaspoon peppermint extract until fully incorporated.
03 - Pour the melted semisweet chocolate onto the prepared baking sheet. Use an offset spatula to spread it evenly into a rectangle approximately 9x12 inches.
04 - Using the same melting method, heat the white chocolate until completely smooth and fluid. Stir in the remaining ½ teaspoon peppermint extract.
05 - Drop spoonfuls of the melted white chocolate over the semisweet base. Drag a skewer or knife through the chocolates in swirling motions to create a marbled pattern.
06 - Immediately sprinkle the green M&Ms or mint candies, green sprinkles, and mini chocolate chips evenly across the surface while the chocolate is still soft.
07 - Gently press the toppings into the chocolate with your fingertips or the back of a spoon to ensure they adhere properly.
08 - Refrigerate the bark for at least 30 minutes, or until completely firm and set throughout.
09 - Break or cut the bark into irregular pieces and serve immediately, or store for later enjoyment.