Spray the bottom and sides of a 6 quart slow cooker (or similar) with cooking spray.
Season beef with steak seasoning, black pepper and thyme. Arrange in the bottom of the crock pot. Arrange onion and garlic on top of the beef.
In a small bowl whisk together the beef stock, soy sauce, Worcestershire sauce, mustard and brown sugar. Pour evenly over the beef.
Lock the lid in place. Cook on low for 6-8 hours or on high for 3-4 hours or until the beef is fork tender.
Once the beef is done increase to high heat. Uncover and add the peas. Stir to distribute.
Cornstarch Slurry: In a small bowl whisk together the heavy cream and cornstarch until completely dissolved. Stir this into the crockpot. Repeat the process as needed, using one tablespoon of cornstarch dissolved in two-three tablespoons of cream, to thicken the sauce to your taste.
Simmer on high uncovered for 15-20 minutes. Meanwhile, cook the egg noodles according to the package instructions. Drain well.
Add cooked noodles to the crock pot and stir to combine. Serve immediately garnished with fresh thyme or parsley.