Preheat your oven to 350°F.
Cook the egg noodles in a large pot of salted water until they are just tender, then drain and set aside.
In a skillet, warm the olive oil over medium heat. Add the chopped onion and cook until soft and translucent, about 3-4 minutes.
Add the minced garlic and sauté for another minute until fragrant.
In a large bowl, mix together the drained noodles, sautéed onion and garlic, shredded turkey, frozen peas, cream of mushroom soup, sour cream, thyme, salt, and black pepper until evenly coated.
Pour the mixture into a greased 9x13 inch baking dish, spreading it out evenly.
Top with shredded cheddar cheese and sprinkle breadcrumbs over the cheese layer.
Bake the casserole for 25-30 minutes, or until hot and bubbly, and the top is golden brown.
Allow to rest for about 5 minutes before serving.