Step 1: Preheat Oven and Prepare Chicken: Preheat oven to 375F (190C). In a large oven-safe skillet or Dutch oven, toss chicken pieces with a drizzle of olive oil, salt, and pepper.
Step 2: Saut Vegetables: Heat the skillet over medium heat. Add chopped onion, carrots, and celery to the skillet and saut for 5-7 minutes, or until the vegetables begin to soften.
Step 3: Cook Chicken: Add the chicken pieces to the skillet with the vegetables. Cook until the chicken is lightly browned on all sides but not fully cooked through, about 5 minutes.
Step 4: Add Noodles and Broth: Stir in the whole wheat egg noodles and pour in the low-sodium chicken broth. Bring the mixture to a simmer, ensuring the noodles are submerged in the broth.
Step 5: Bake Casserole: Cover the skillet or Dutch oven with a lid or aluminum foil and transfer to the preheated oven. Bake for 20-25 minutes, or until the noodles are tender and the chicken is cooked through.
Step 6: Stir in Remaining Ingredients: Remove the casserole from the oven and carefully stir in the frozen peas, Greek yogurt, Parmesan cheese, parsley, and dried thyme. Mix until well combined and the sauce is creamy.
Step 7: Add Breadcrumbs (Optional): If desired, sprinkle the whole wheat breadcrumbs over the top of the casserole for a golden crust.
Step 8: Broil (Optional): For extra browning, broil the casserole for 1-2 minutes, watching carefully to prevent burning.
Step 9: Serve and Enjoy: Let the casserole cool for a few minutes before serving. Garnish with additional fresh parsley if desired.
Tips: For a vegetarian option, substitute the chicken with 1 (14 oz) can of drained and rinsed chickpeas or cubed firm tofu. To add more vegetables, include chopped mushrooms, zucchini, or spinach. For a gluten-free version, use gluten-free noodles and ensure that all other ingredients are gluten-free. A sprinkle of paprika can add a touch of smokiness.