Place the dark chocolate into a microwave-safe bowl and melt in 30-second intervals, stirring each time until smooth and glossy.
Add the nut butter, honey, vanilla extract, and coconut oil to the melted chocolate. Stir thoroughly until the mixture is smooth and well combined.
In a large mixing bowl, combine the oats and optional add-ins like chopped nuts or dried fruit. Pour the chocolate mixture over the oats and stir vigorously until everything is coated evenly and the mixture is sticky.
Using a spoon or your hands, scoop out about 1-2 tablespoons of the mixture and roll it into a compact ball. Place each ball on a parchment-lined baking sheet.
Gently press each ball down slightly to flatten, shaping them into snack-sized disks if desired. Repeat until all the mixture is used.
Place the baking sheet in the refrigerator and chill for at least 30 minutes, or until the bites are firm and glossy.
Once set, transfer the bites to an airtight container. Store in the fridge for up to a week or freeze for longer storage.
When ready to enjoy, let the bites sit at room temperature for 5 minutes to soften slightly, then serve and savor the chewy, chocolatey goodness.