Add the plain non-fat Greek yogurt to a medium mixing bowl. Sprinkle in the vanilla protein powder and cinnamon.
Stir the ingredients together thoroughly until the mixture becomes smooth, creamy, and completely free of lumps. If needed, add a small splash of milk to loosen the consistency.
Spoon half of the prepared yogurt mixture into the bottom of a serving glass, mason jar, or bowl, spreading it evenly to create the first layer.
Layer half of the sliced strawberries and blueberries over the yogurt mixture, distributing them evenly throughout the glass.
Carefully spoon the remaining yogurt mixture over the berry layer, smoothing it gently with the back of a spoon.
Top the parfait with the remaining strawberries and blueberries, creating a colorful final layer.
Sprinkle the chia seeds and sliced almonds evenly over the top for added texture, healthy fats, and fiber.
Drizzle with honey if you prefer additional sweetness, adjusting the amount according to your taste preferences.
Serve immediately for the freshest flavor and crunch, or cover and refrigerate for up to 24 hours if preparing ahead.
If meal prepping, consider adding the almonds just before serving to maintain their crisp texture.