01 - Line an 8x8-inch baking pan with parchment paper, ensuring an overhang on opposite sides for easy removal later.
02 - In a medium mixing bowl, combine granola, honey or maple syrup, and melted coconut oil. Stir until all ingredients are evenly distributed and the granola is coated.
03 - Transfer the granola mixture to the prepared pan. Using the back of a spoon or your hands, press firmly and evenly across the bottom to create a compact base 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 - Distribute mixed berries evenly over the yogurt layer. If using, sprinkle chia seeds across the top for added texture and nutritional benefits.
07 - Transfer the pan to the freezer and freeze for at least 4 hours, or overnight, until completely firm and set.
08 - Using the parchment paper overhang, lift the frozen slab from the pan. Place on a cutting board and let sit at room temperature for 5-10 minutes to soften slightly before cutting.
09 - Using a sharp knife, slice into 12 equal-sized bars. For clean cuts, wipe the knife blade with a damp cloth between slices.