If using frozen berries, they should not be thawed before making the recipe.
A pie made of frozen fruit will be better on the same day while a pie made with fresh fruit will keep for up to 2 days.
Depending on the power of your microwave, gelatin will take more or less time to melt. Whisk vigorously when you stir the gelatin mixture into the yogurt or it will form small lumps. If this happens, the mixture won’t be as smooth, but equally good.