01 - Line an 8x8-inch baking pan with parchment paper, leaving an overhang on opposite sides for easy removal later.
02 - In a medium bowl, combine granola, honey (or maple syrup), and melted coconut oil. Mix until all ingredients are evenly coated and the mixture holds together when pressed.
03 - Transfer the granola mixture to the prepared pan. Press firmly and evenly across the bottom using the back of a spoon or your fingers to create a compact, uniform layer.
04 - In a separate bowl, whisk together Greek yogurt, honey (or agave syrup), and vanilla extract until completely smooth and well combined.
05 - Pour the yogurt mixture over the granola base. Use a spatula to spread it evenly, ensuring full coverage to the edges.
06 - Scatter the mixed berries evenly over the yogurt layer. If using, sprinkle chia seeds across the top 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 - Using the parchment paper overhang, lift the frozen slab out of the pan. Place on a cutting board and let sit for 5-10 minutes at room temperature to soften slightly for easier slicing. Cut into 12 bars using a sharp knife.
09 - Store bars in an airtight container in the freezer. Serve frozen or allow to thaw for 2-3 minutes before eating for optimal texture.