Line a baking sheet with parchment paper.
Wash raspberries in a mix of water and a splash of vinegar. Pat dry completely.
Arrange raspberries on parchment in a tight single layer.
Melt dark chocolate and 1 teaspoon coconut oil in a microwave-safe bowl, stirring until smooth.
Drizzle over raspberries.
Melt white chocolate and remaining coconut oil, drizzle over top.
Freeze for 30 minutes, then break into bark pieces.
Store in an airtight container in the freezer for up to 2 months.