In a medium bowl, combine the plain Greek yogurt, honey, and vanilla extract. Stir until smooth and well mixed.
Add the ground cinnamon and stir to incorporate evenly.
In a small separate bowl, mix the all-purpose flour and brown sugar together.
Gently fold the flour and brown sugar mixture into the yogurt mixture until just combined.
Fold in the mini chocolate chips and finely chopped walnuts evenly throughout the yogurt.
Spoon the yogurt into serving bowls or jars.
Serve immediately or refrigerate for up to 24 hours before serving.