1. Line a large baking sheet with foil.
2. In a large zip-top bag, add the pudding mix, agar-agar powder mix, powdered sugar, and optional sprinkles. Mix to combine and set aside.
3. Measure the cereal into a large bowl.
4. Keep the vanilla bark in its container and place in the microwave.
5. Microwave 1 minute, stir, then heat an additional minute.
6. Pour melted vanilla bark over cereal and stir until cereal is completely coated.
7. Dump into the bag with the powdered sugar mixture, shake until all the cereal is coated.
8. Pour onto the large foil-covered pan until set.
9. Store in a covered container for up to 2 weeks.