Chicken with Balsamic Glaze Recipe

• 6 skinless, boneless chicken breast halves
• 1 teaspoon garlic salt
• ground black pepper to taste
• 2 tablespoons olive oil
• 1 onion, thinly sliced
• 1 (14.5 ounce) can diced tomatoes
• 1/2 cup balsamic vinegar
• 1 teaspoon dried basil
• 1 teaspoon dried oregano
• 1 teaspoon dried rosemary
• 1/2 teaspoon dried thyme

Directions