Based on the recipe found here.
INSTANTPOT BEEF STROGANOFF
2 lbs. stew meat
1 medium onion, sliced
1 c. sliced mushrooms
3 Tbsp. butter
2 tsp. garlic, minced
2 Tbsp. flour
3 c. beef broth
1/4 c. Worcestershire sauce
10-oz. egg noodles
1/2 c. sour cream
2 Tbsp. corn starch
Turn pressure cooker on Saute mode. Add meat, onions, mushrooms and butter to hot pressure cooker. Once butter is melted and meat is browned, add garlic and stir until fragrant. Sprinkle the flour and stir to coat. Add beef broth, Worcestershire sauce. Cover with steam valve turned to sealed position. Set to Pressure Cook for 15 minutes. Do quick release and add egg noodles. Pressure cook for 3 minutes and do quick release. Stir in sour cream. Make slurry from 1/4 c. broth and corn starch and stir into stroganoff. Turn on to Soup setting if additional heat is needed to thicken. Add salt & pepper as needed.