In a medium bowl, combine the Greek yogurt, honey (or maple syrup), and vanilla extract. Mix well until smooth and creamy.
In serving glasses or bowls, layer the yogurt mixture, followed by a layer of granola, and then a layer of mixed berries. Repeat the layers until all ingredients are used, finishing with a layer of berries on top.
If using, sprinkle chia seeds over the top layer of berries for added texture and nutrition.
Garnish with fresh mint leaves if desired.
Serve immediately or refrigerate for up to 30 minutes for a chilled parfait.