2Bring a large pot of salted water to a boil over high heat, add egg noodles, and cook until tender with a bite, 8 to 10 minutes. Drain and set aside.
3Add butter, heavy cream, and cream cheese to a saucepan, place over medium heat, and cook, stirring, until sauce is smooth, about 5 minutes. Remove from heat and set aside.
4Add noodles to the prepared casserole dish; top with crab and half of mozzarella.
5Pour sauce on top and stir to combine. Smooth out the mixture and top with remaining cheese.
6Bake in the preheated oven until casserole is golden brown and bubbly, 25 to 30 minutes.
7Garnish with wonton chips, green onions and sweet chili sauce if desired. Serve immediately.