In large skillet, heat oil over medium-high heat. Add turkey, zucchini, yellow squash, onion, bell pepper, garlic, oregano, salt and pepper. Cook 10-12 minutes or until turkey is no longer pink and veggies are tender. Break up turkey into crumbles while cooking.
Drain excess grease.
Add drained and rinsed black beans, tomatoes, banana peppers and balsamic vinegar. Heat through.
Taste and adjust seasonings. May add a bit more juice from banana peppers, as well. I also added a squirt of sriracha.
Serve over cooked couscous, rice, or quinoa. Sprinkle with feta cheese if desired.