Let's cook.
In a medium bowl, combine the Greek yogurt, 1/4 cup honey, and vanilla extract. Stir until well combined and smooth.
Divide half of the yogurt mixture evenly among 4 small glasses or parfait dishes.
Sprinkle half of the chopped pistachios and half of the graham cracker crumbs over the yogurt layers.
Top with the remaining yogurt mixture, dividing it evenly among the glasses.
Garnish each parfait with the remaining chopped pistachios and graham cracker crumbs.
Drizzle a little extra honey over each parfait just before serving.
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