Cut the turkey sausage into bite-size pieces.
Heat a large skillet over medium heat. Spray with olive oil spray, then add the bell peppers and onions.
Let the veggies cook 5-7 minutes, or until tender. During the last minute add the garlic and mix together.
Add the can of diced tomatoes (do not drain) and the turkey sausage.
Season with oregano, salt, and black pepper, then let cook for 5 minutes.