• Preheat oven to 210°C | 410°F.
• Season each chicken thigh with the oregano, basil, salt and pepper.
• Heat the oil (or cooking spray) in a large oven-proof pan or skillet over medium-high heat. Sear the chicken on both sides until golden brown, about 4 minutes each side. Transfer chicken to a plate; drain most of the excess oil, leaving about a teaspoon worth.
• Return the skillet back to the stove; fry garlic until fragrant (about 1 minute). Add the vinegar and brown sugar; stirring to combine while heating through. Bring to a simmer, while stirring occasionally, until glaze has thickened (about 5-6 minutes).
• Return the chicken to the pan, turning in the glaze to evenly coat. Add 1 cup of the tomatoes, whole, around the chicken and place the chicken into the oven. Bake until the chicken is completely cooked through (about 30 minutes). Top each chicken with a slice of mozzarella cheese; return back into the oven for a further 5 minutes or until the cheese has melted.
• Slice the remaining ½ cup tomatoes in half; place them on top of the cheese; pour over some of the balsamic sauce from the pan and garnish with basil. Serve immediately.

Optional:

• If wanting to serve with extra balsamic glaze (as pictured above), make your glaze while the chicken is in the oven. Combine the vinegar and sugar in a small pot and bring to the boil. Reduce heat, allowing to simmer while stirring occasionally, until the glaze is thickened and reduced by half (about 5-6 minutes). Drizzle over the chicken when ready to serve.