Creating your turkey casserole is simple when you follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Casserole Dish: Grease a 9×13-inch casserole dish with cooking spray or olive oil.
3. Combine Ingredients: In a large mixing bowl, combine the shredded turkey, mixed vegetables, cream of mushroom soup, milk, garlic powder, onion powder, salt, and pepper. Mix until all ingredients are incorporated.
4. Add Cheese: Stir in 1 cup of shredded cheese to the turkey and vegetable mixture.
5. Transfer to Casserole Dish: Pour the mixture into the greased casserole dish, spreading it evenly.
6. Top with Remaining Cheese: Sprinkle the remaining 1 cup of shredded cheese on top of the turkey mixture.
7. Prepare Breadcrumbs: In a small bowl, combine breadcrumbs with a tablespoon of olive oil, mixing well to coat. Sprinkle the breadcrumb mixture evenly over the cheese layer.
8. Bake: Cover with foil and bake in the preheated oven for 20 minutes. Remove the foil and bake for an additional 10 minutes or until the top is golden and bubbly.
9. Cool and Serve: Once out of the oven, let it cool for a few minutes before serving.

This straightforward approach ensures that you create a comforting and delicious turkey casserole with relative ease.