Line a large plate or cooking sheet with parchment paper.
Combine the oats, crispy rice and cinnamon in a large mixing bowl and lightly mix with a spatula.
Place the frozen blueberries, peanut butter, maple syrup, vanilla and sea salt in a food processor or blender. Blend until somewhat smooth or a thick liquid forms. Add the chia seeds and pulse until just combined.
Add the blueberry mixture to a large mixing bowl, scraping the edges with a spatula and then gently mixing to combine with the oats and crispy rice.
Lightly wet your hands with a small splash of water (but not too much). Roll the mixture into small balls, about 1-2 inches in diameter. Place the balls on the parchment-lined plate.
Allow the balls to set in the freezer for atleast 30 minutes, or until they hold their shape well, and then enjoy!