To a large serving bowl, add sliced strawberries and blueberries. Then, using a large spoon, stir to combine. Set aside.
In a small mixing bowl, whisk together the dressing ingredients. Pour the dressing over the fruit, then toss with a large spoon to combine.
Just before serving, stir mini-marshmallows (if using) into the mixed berry salad. This way, they won't become too soggy.
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Notes
Wait until just before serving to add the marshmallows to prevent them from getting too soggy before they even reach the plate.To make Strawberry Blueberry Salad ahead of time:It is easy to make ahead. As long as you leave the dressing off, you can prep the berries up to 4 days ahead of time.How to Store Blueberry Salad:The mixed berry salad will stay fresh for up to 5 days in the fridge. However, the dressing will make the berries get soggy pretty quickly.If you anticipate leftovers, store the dressing and fruit separately. The dressing will keep a little longer than the fruit.