Place the meatballs in the Instant Pot. Pour in the beef broth, then add Worcestershire sauce, allspice, garlic, dried parsley, salt, and black pepper. Stir gently to mix the flavors.
Spread the egg noodles over the meatballs. Press them down lightly without stirring, so they absorb the flavors during cooking.
Secure the lid and set the valve to sealing. Select the 'Pressure Cook' mode on high and set the timer for 3 minutes. Allow extra time for the pot to come to pressure (about 10 minutes).
Once cooking is complete, do a quick release of the pressure. In a small bowl, whisk the heavy cream with the cornstarch. Set the pot to 'Sauté' mode and stir the cream mixture into the dish, letting it cook until the sauce thickens.
Give the dish a final stir, adjust salt and pepper to taste, and serve hot, garnished with parsley.
For a heartier meal, serve these meatballs and noodles with a side of steamed vegetables or a fresh salad.