Slice cherry tomatoes into thirds.

Cut spinach leaves into small pieces after removing the stems.

Cut mozzarella cheese into small, tomato-sized pieces.

Chop white onion to about the size of the tomatoes.

In a bowl, combine balsamic vinegar and garlic powder.

Add tomatoes, spinach, mozzarella, and onion to the balsamic vinegar mixture.

Toss well to marinate for at least 5 minutes.

Take a toothpick and pierce a tomato slice, then a mozzarella slice, then a spinach leaf, followed by an onion slice.

Repeat the sequence one more time on the same toothpick.

Repeat on as many toothpicks as needed.