Place the cored and diced apple cubes into a medium-sized mixing bowl.
In a separate small container, whisk together the Greek yogurt, honey, and ground cinnamon until the mixture is homogenous and smooth.
Fold the yogurt mixture into the apples using a silicone spatula until all apple surfaces are thoroughly coated.
Transfer the salad to a serving bowl or a glass mason jar.
Gently heat the peanut butter in a microwave-safe dish for 15 seconds until it reached a fluid, drizzlable consistency.
Drizzle the warm peanut butter over the top of the apple salad in a zig-zag pattern.
Sprinkle the granola over the top immediately before consumption to ensure the clusters remain crisp.