Cook the egg noodles in a large pot of salted water according to package instructions until al dente. Drain and set aside.
In a large skillet or saucepan, combine the cream of chicken soup, cream of mushroom soup, milk, sour cream, thyme, garlic salt, onion powder and pepper. Whisk until smooth.
Heat the soup mixture over medium heat, stirring occasionally, until it comes to a simmer.
Add the cooked, cubed chicken and frozen peas to the skillet. Stir to combine and cook until the peas are heated through, about 2-3 minutes.
Add the cooked egg noodles to the skillet and toss to coat evenly with the creamy sauce.
Remove from heat and stir in the grated Parmesan cheese.
Garnish with chopped fresh parsley, if desired.