Preheat your oven to 400°F and line a baking sheet with parchment paper.
Pound the chicken breast to an even thickness if necessary for uniform cooking.
In a shallow dish, pour in the egg white. In another dish, combine whole wheat breadcrumbs, dried oregano, salt, and pepper.
Dip the chicken breast first in the egg white, then dredge thoroughly in the breadcrumb mixture until well coated.
Spray a baking dish lightly with olive oil spray and place the coated chicken breast inside.
Bake the chicken for 20-25 minutes, until the internal temperature reaches 165°F and the crust is lightly crisp.
While the chicken bakes, prepare the fresh marinara sauce by finely dicing the tomatoes and mincing the garlic.
Heat a small saucepan over medium heat, spray lightly with olive oil spray, add garlic and sauté briefly until fragrant, then add diced tomatoes and fresh basil. Bring to a simmer and let cook for about 5-8 minutes. Season lightly with salt and pepper.
Once the chicken is done, serve it topped with a generous spoonful of the fresh marinara sauce.