Thread the top half of one strawberry onto a wooden skewer with the hull facing up.
Next, fold one basil leaf in half, dark side facing out, and add it to the skewer.
Add one mini-Mozzarella ball, followed by another folded basil leaf, and then the bottom half of the strawberry.
Repeat with the remaining strawberries, basil, and Mozzarella until you have 16 completed skewers.
Arrange skewers on a serving platter and set aside.
Prepare the glaze by adding balsamic vinegar to a small sauté pan over medium-high heat. Cook, stirring frequently, until the vinegar is reduced to about ⅓ of its original volume.
Remove glaze from heat and let cool slightly. Drizzle over the skewers, along with some extra virgin olive oil, if desired.