01 - Line an 8x8-inch baking pan with parchment paper, leaving an overhang for easy removal.
02 - In a medium bowl, combine granola, honey (or maple syrup), and melted coconut oil until evenly coated.
03 - Press the granola mixture firmly and evenly into the bottom of the prepared pan to form a compact base layer.
04 - In a separate bowl, whisk Greek yogurt, honey (or agave), and vanilla extract until smooth and well blended.
05 - Pour the yogurt mixture over the granola base and spread evenly with a spatula to cover completely.
06 - Distribute mixed berries over the yogurt layer. Sprinkle with chia seeds if using for added texture and nutrition.
07 - Transfer the pan to the freezer and freeze for at least 4 hours, or until completely firm throughout.
08 - Use the parchment overhang to lift the frozen slab from the pan. Place on a cutting board and let rest for 5-10 minutes to soften slightly before slicing into bars.
09 - Store bars in an airtight container in the freezer. Serve frozen or allow to thaw for a few minutes before eating.