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Preheat oven to 350°F. Coat a rectangular, 2 quart baking dish with nonstick cooking spray; set aside.
In a large skillet heat oil over medium-high heat. Add chicken to skillet; cook and stir until browned.
Place chicken in baking dish. Sprinkle with croutons, oregano and pepper; arrange tomatoes on top.
Tightly cover baking dish with foil. Bake for 15 minutes.
Remove foil; sprinkle with cheese. Bake 5 minutes more or until cheese melts and chicken is no longer pink (165°F). Serve warm.