If the bark tastes too bitter once frozen, add 1–2 extra teaspoons of sweetener to the yogurt next time rather than switching to a sweeter chocolate.
To boost protein further, use a high-protein Greek yogurt or stir in a scoop of unflavored or vanilla protein powder. Thin with a splash of milk if the mixture gets too thick to spread.
For a kid-friendlier version, swap the dark chocolate for semi-sweet chocolate chips and cut into smaller pieces for snack plates or lunchboxes.
Store in an airtight freezer-safe container with wax paper between layers for up to 1 month.