Let's cook.
Preheat a small dry skillet over medium heat. Add the chopped walnuts and toast for 3-5 minutes, stirring frequently, until fragrant and lightly browned. Be careful not to burn them.
Remove the toasted walnuts from the skillet and let them cool completely on a plate.
In a medium bowl, combine the Greek yogurt, 1/4 cup honey, and vanilla extract. Stir until well combined and smooth.
In a separate small bowl, toss the cooled toasted walnuts with the cinnamon.
To assemble the parfaits, spoon a layer of the honey-yogurt mixture into the bottom of four serving glasses or bowls.
Sprinkle a layer of the cinnamon-toasted walnuts over the yogurt.
Repeat the layers, finishing with a final layer of yogurt and a generous sprinkle of walnuts.
Drizzle a little extra honey over the top of each parfait just before serving.
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