To create Simple Chicken Breast with Onions and Tomatoes, follow these straightforward steps:

1. Prep the Ingredients: Slice the onions, chop the tomatoes, and mince the garlic. Set them aside.
2. Heat the Pan: In a large skillet, heat the olive oil over medium heat.
3. Cook the Chicken: Add the chicken breasts to the skillet. Season with salt, black pepper, and oregano. Cook for about 5-7 minutes on each side, or until they are golden brown and cooked through.
4. Remove the Chicken: Once cooked, remove the chicken from the skillet and set aside on a plate.
5. Sauté the Onions: In the same skillet, add the sliced onions. Cook until they are translucent and softened, about 5 minutes.
6. Add the Garlic: Stir in the minced garlic and cook for another minute until fragrant.
7. Incorporate the Tomatoes: Add the chopped tomatoes to the skillet. Cook for about 3-4 minutes until they soften.
8. Combine with Chicken: Return the chicken breasts to the skillet. Spoon the onion and tomato mixture over the chicken, allowing the flavors to meld.
9. Simmer Together: Let everything simmer together for an additional 5 minutes on low heat.
10. Garnish and Serve: Optional: Top with fresh basil leaves before serving for added freshness.

These steps will guide you through making this incredible dish with ease.