Italian Chicken Sliders with Tomato Jam

Name: Italian Chicken Sliders with Tomato Jam
Ingredients: 2 tablespoons olive oil; 1 small onion, diced; 2 cloves garlic, chopped; 1 (15-ounce) can diced tomatoes; 1/4 cup balsamic vinegar; 1/2 teaspoon dried oregano; 2 tablespoons brown sugar; Pinch salt and freshly ground black pepper; 3 tablespoons chopped fresh parsley leaves; 1 pound boneless skinless chicken breast, about 2 large breasts; Salt and fresh ground black pepper; 3 tablespoons olive oil; 12 slices pancetta; 1 (8-ounce) piece fresh mozzarella, sliced into 12 slices; 12 small crusty dinner rolls, cut in half with a fork; Tomato jam; 12 fresh basil leaves