1.

Line a baking tray with parchment paper

2.

Use a blender to blend half of the yogurt with half of the blueberries

3.

Spread the plain yogurt and then drop lumps of the blueberry yogurt across the baking tray, mixing through with a spoon to make a pattern

4.

Sprinkle with the other berries, oats if using or other ingredients like coconut, seeds etc

5.

Place in the freezer for about an hour until firm

6.

Break apart to make bark