In a medium bowl, combine the Greek yogurt and protein powder. Stir vigorously until the protein powder is fully incorporated and the mixture is smooth.

If using frozen berries, you can gently warm them in the microwave for about 30 seconds to achieve a slightly softer, jam-like consistency. Alternatively, add them directly to the bowl.

Spoon the yogurt mixture into your serving bowl. Arrange the berries, granola, and chopped walnuts over the top. Sprinkle with chia seeds, if desired.