Prep your pan. Line a baking sheet with parchment paper. Make sure it will fit flat in your freezer.
Mix the base. In a bowl, stir together Greek yogurt, honey or maple syrup, vanilla, and a small pinch of sea salt. Taste and adjust sweetness as you like.
Spread it out. Pour the yogurt mixture onto the lined pan and spread it into an even layer, about 1/4 inch thick.
Thinner layers freeze faster and break more easily.
Add the toppings. Scatter blueberries evenly over the yogurt. Sprinkle on nuts or seeds and chocolate chips if using. Gently press them in so they stick after freezing.
Freeze. Place the tray in the freezer, uncovered, for 2–4 hours, or until completely firm.
Break into pieces. Lift the parchment off the tray and break the frozen yogurt into bark-style shards.
Go for snack-size pieces.
Store for later. Transfer the bark to an airtight container or freezer bag. Keep frozen until you’re ready to eat.