2tablespoonscorn starch + ¼ cup beef broth or cold water, optional
Set pressure cooker to SAUTE. Add butter, garlic, and mushrooms. Once butter is completely melted, sprinkle in flour and stir to coat the mushrooms.
Add 3 cups beef broth, worcestershire sauce, and the stew meat. Cover, turn steam valve to the sealed position, and set to PRESSURE COOK (or MANUAL) for 15 minutes.
Do a quick release (turn to VENTING position and remove lid once float valve drops). Stir in egg noodles and set to PRESSURE COOK (or MANUAL) for 3 minutes. Do another quick release.
Stir in sour cream, taste, and add salt and pepper as needed. Serve OR for a thicker stroganoff sauce, set pressure cooker to SOUP setting, whisk together 1/4 cup broth and corn starch, and stir into the stroganoff. Once sauce comes to a boil and has thickened, serve.
Serving: feel free to skip the egg noodles and serve this over mashed potatoes or rice.