Preheat your oven to 350°F (175°C) and lightly grease a 2-quart casserole dish with olive oil.
In a large mixing bowl, combine the shredded turkey, cooked pasta, and frozen mixed vegetables. Add the condensed cream of mushroom soup and sour cream, followed by garlic powder, onion powder, salt, and pepper. Stir until thoroughly incorporated.
Gently fold in the shredded cheddar cheese, reserving a small handful for topping.
Transfer the turkey mixture into the prepared casserole dish, smoothing it out to create an even layer.
Sprinkle breadcrumbs over the top of the casserole if desired, then add the reserved cheddar cheese.
Bake in the preheated oven for 25-30 minutes, or until bubbly and the cheese is golden brown.
Remove from the oven and allow to cool for about 5 minutes before serving.
Garnish with freshly chopped parsley just before serving.
Notes
Consider serving with a simple green salad to balance the richness.