Preheat your oven to 375°F.
Dice the chicken breast into small bite-sized pieces. Season lightly with salt, pepper, and a pinch of mixed dried herbs.
Chop the carrot, celery, and onion into small cubes. Mince the garlic.
In a skillet, warm the olive oil over medium heat and sauté the garlic until fragrant.
Add the diced chicken to the skillet and cook until lightly browned on all sides.
Stir in the chopped vegetables (carrot, celery, onion) and cook for about 3-4 minutes until they begin to soften slightly.
Sprinkle the whole wheat flour over the mixture and stir well to coat the ingredients evenly.
Pour in the chicken broth, low-fat milk, and add the green peas. Stir to combine.
Mix in the low-fat Greek yogurt and additional dried herbs. Allow the sauce to gently simmer for another 2-3 minutes until it thickens.
Transfer the entire mixture to an oven-safe baking dish.
Bake in the preheated oven for 15-20 minutes until the top is slightly golden and the flavors meld together.
Remove from the oven, let cool for a couple of minutes, and serve warm.