Prep and Season the Protein
Pat the chicken dry with paper towels (this ensures a better sear). Season both sides generously with sea salt, cracked black pepper, and dried oregano.
Sear for Color and Flavor
Heat the extra virgin olive oil in a large, heavy-bottomed skillet over medium-high heat. Place the chicken in the pan and brown for 5 minutes per side.
Note: The chicken does not need to be cooked through yet; you are simply developing a golden crust (the "Maillard reaction") for flavor. Remove the chicken and set it aside on a plate.
Sauté the Base Vegetables
In the same skillet (don't wash it!), add the diced onion and sliced bell pepper. Sauté for 3 minutes until they begin to soften. Add the minced garlic and sliced zucchini, cooking for another 2 minutes until the garlic is fragrant.
Deglaze the Skillet
Pour in the chicken broth or dry white wine. Use a wooden spoon to scrape up all the brown bits (the fond) stuck to the bottom of the pan. This is where the concentrated "Italian" flavor lives!
Simmer to Perfection
Add the cherry tomatoes to the pan and nestle the browned chicken back into the vegetable mixture. Cover the skillet with a lid, reduce heat to medium-low, and simmer for 10–15 minutes.
Pro Tip: Use a meat thermometer to ensure the thickest part of the chicken reaches an internal temperature of 165°F (74°C).
The Fresh Finish
Remove from heat. Garnish the dish with a handful of torn fresh basil leaves. Serve immediately while the vegetables are vibrant and the chicken is juicy.