In a small saucepan, bring balsamic vinegar to a boil, then lower heat and allow to simmer until it has thickened to a syrup consistency. Allow to cool.
Add the cherry tomatoes, basil leaves, and mozzarella to a toothpick or small skewer.
Drizzle the balsamic reduction all over the skewers.
Top with course salt and fresh cracked pepper, if desired.
Video
Notes
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I used mozzarella balls for these, but you can also used sliced mozzarella and just cut it up (or even a diced cheese stick in a pinch). It's really best fresh though, like the kind you find near the deli.
If you don't want to make your own balsamic glaze, they do sell it already reduced. You can usually find it on the shelf with the rest of the vinegars.