California Caprese Sandwiches

makes 4 sandwiches

1 French baguette, halved lengthwise
2 tablespoons extra virgin olive oil
1 clove garlic, minced/crushed
1 cup shredded chicken breast (optional)
2 fresh tomatoes, sliced
2 fresh mozzarella balls, sliced
1-2 avocados
salt and freshly ground pepper
fresh basil leaves
balsamic vinegar