- Preheat oven to 375°F and grease a 9x13 inch baking dish. 
- Boil egg noodles until slightly undercooked; drain. 
- Sauté onion and garlic in butter until fragrant. 
- Stir in cream of mushroom soup, sour cream, and milk. 
- Add seasonings and simmer for 2 minutes. 
- Fold in tuna, peas, and half the cheese. 
- Combine noodles with sauce; mix well. 
- Pour into dish and top with remaining cheese and breadcrumb mix. 
- Bake 25–30 minutes until golden and bubbly. 
- Rest 5 minutes before serving.