Wash and dry six 8-ounce Mason jars with lids. Mason jelly jars are perfect for these parfaits.: The first sensory clue is the clink of glass as you set the jars on the counter, and a crisp, clean smell from freshly washed jars helps you feel organized. Clean, dry jars prevent dilution and off flavors, and drying thoroughly ensures no water drips into the layers. One common mistake is leaving slight moisture inside, which will make the granola soggy, so use a clean towel or air dry upside down to avoid this problem.
Place a layer of granola in the bottom of each jar (about 2 tablespoons).: You will hear the granular sound of the granola settling and see a textured base that will support the other components. This initial crunch layer acts as a barrier and offers the first contrast in each spoonful. Avoid pressing it down flat, which can compact the texture and reduce the delightful crunch. A frequent error is adding too much, which makes the jar heavy on the bottom; measure visually to keep balance.
Top the granola with about 1/4 cup of yogurt.: When you spoon in the Greek yogurt , it should look thick and glossy, forming a clean layer above the granola. The cool, creamy scent and the smooth surface are signs of a good yogurt. Use a gentle dollop rather than pouring, so the layers remain distinct. A mistake to avoid is mixing the yogurt and granola at this stage, since that will ruin the layered visual and alter texture.
Add mixed berries over the yogurt (about 1-2 tablespoons).: The berries will sit like jewels on the white yogurt, releasing a faint berry aroma and occasionally a bead of juice. Scatter them evenly so every jar has color from the center to the edge. If you mound them too high, they may tip when you stack another layer, so keep distribution even. One pitfall is using wet berries; always pat them dry to maintain the granola crunch.
Repeat the layers one time and top each jar with a sprinkle of granola.: As you repeat the sequence, note how the jars take on a striped, appealing look and the contrast intensifies. The top sprinkle of granola should sit lightly, offering a crunchy crown. Pressing the top layer in will flatten it and reduce textural impact, so let it rest naturally. A common oversight is over layering which can make the jar overflow when you try to close the lid; leave a small headspace.
Cover each jar with the lid or cover with plastic wrap and refrigerate.: You will hear the slight click when the lid seals, and the chilled, set aroma will develop after refrigeration. Cooling helps the flavors meld and the yogurt firm up a touch, creating a pleasant spooning texture. Store upright so juices do not shift into the granola layer prematurely. One mistake to avoid is stacking jars tightly before they are fully cooled, which can cause condensation and sogginess; let them rest flat and undisturbed.