1Heat 2 tablespoons of olive oil in a large skillet over medium-high heat.
Season the chicken breasts with salt and pepper, then add them to the skillet. Cook until browned on both sides, about 5-7 minutes per side. Remove the chicken from the skillet and set aside.
In the same skillet, add the chopped onion and minced garlic. Sauté until the onion is translucent, about 5 minutes.
Add the sliced red and green bell peppers to the skillet and cook for another 5 minutes until they start to soften.
Stir in the canned tomatoes and dried oregano. Bring the mixture to a simmer.
Return the chicken breasts to the skillet, nestling them into the tomato and pepper mixture.
Cover the skillet and let the dish simmer for 20-25 minutes, or until the chicken is cooked through and tender.
Adjust seasoning with additional salt and pepper if needed.
Serve the Chicken Cacciatore hot, garnished with fresh herbs if desired.