Mediterranean Skillet

chicken breasts, grilled and sliced

diced tomatoes with basil and oregano, drained

jar artichoke hearts, drained

mushrooms, cleaned and chopped

spinach, roughly chopped

kalamata olives, chopped

sun-dried tomatoes, chopped

fresh basil

yellow onion, finely chopped

garlic, minced

extra-virgin olive oil, divided

balsamic vinegar

dried oregano

kosher salt and freshly ground pepper,