Add the blueberries, chia seeds and 1 tablespoon sugar to a blender. Blend until completely smooth, refrigerate.
Remove the bowl and beaters from the freezer. Add the heavy cream, vanilla and powdered sugar to the bowl and whip on high until soft peaks form.
Fold the whip cream into the blueberry mixture.
Spoon or pipe into pretty bowls or glasses, top with a dollop of whipped cream and reserved blueberries.
Serve immediately.
Reserve a small handful of blueberries and a few dollops of whip cream for garnish (if desired).
Notes
Place thee bowl and beaters for the mixer into the freezer prior to making the whipped cream. Even if it's only for a few minutes, it will make it easier to make the whip cream.