I found this at melskitchencafe.com and it was really good!
1 cup shredded mozzarella cheese
1/4 cup minced fresh basil
2 tablespoons heavy cream
1 tablespoon fresh lemon juice
3 garlic cloves, minced
Salt and pepper
4 boneless, skinless chicken breasts
3 tablespoons mayonnaise, lowfat or regular
1 cup fresh bread crumbs
2 tablespoons olive oil
1 pint cherry tomatoes, halved
Heat oven to 425 degrees F. In a medium bowl, combine the shredded cheese, 2 tablespoons of the minced basil, cream, lemon juice, 2 teaspoons minced garlic, 1/2 teaspoon salt and 1/4 teaspoon pepper.
Cut a pocket in thickest part of chicken breasts, stuff with cheese mixture and seal. Spread tops evenly with mayonnaise.
In a medium bowl, combine the bread crumbs, remaining garlic, remaining fresh basil, and one tablespoon olive oil. Sprinkle crumb mixture over chicken, pressing lightly to adhere.
Toss tomatoes with remaining tablespoon oil, 1/2 teaspoon salt, and pepper to taste. Arrange the tomatoes in the baking dish in and around the chicken. Bake until the crumbs are golden brown and the chicken is cooked through, about 25 minutes. Serve immediately.