Chicken Avocado Caprese Salad

ΒΌ cup (60 mL) balsamic vinegar
2 tablespoons (30 mL) olive oil
2 teaspoons brown sugar
1 teaspoon minced garlic
1 teaspoon dried basil
1 teaspoon salt

4 chicken thigh fillets, skin removed (no bone)*
5 cups Romaine (or cos) lettuce leaves, washed and dried
1 avocado, sliced

1 cup cherry or grape tomatoes, sliced
1/2 cup mini mozzarella / bocconcini cheese balls
1/4 cup basil leaves, thinly sliced
Salt and pepper, to season