Blueberry-Vanilla Frozen Yogurt

Ingredients

• 1 pint (about 2 cups) fresh blueberries, preferably organic (recently added to the “Dirty Dozen” list)
• 2 Tbsp vanilla agave nectar, OR 2 Tbsp regular agave + 1/4 tsp pure vanilla extract
• 2 Tbsp water
• 2 cups vanilla 0% fat Greek yogurt
• 1 cup plain 2% fat Greek yogurt