Simple pressure cooker Beef Stroganoff

Ingredients

• 1.5 lbs beef chuck roast trimmed
• 1 cup diced onion (half of a large onion)
• 8 oz white mushrooms, sliced or quartered
• 8 oz crimini mushrooms, sliced or quartered
• 1 sprig of thyme (3-4 slim stalks)
• 2 tbsp all-purpose flour
• 1 tbsp corn starch
• 2 tbsp butter
• 1.5 cups low sodium chicken stock
• 1 tsp. onion powder
• 1 tsp. garlic powder
• 2 tbsp Worcestershire sauce
• 2 tbsp Soy sauce
• 1 cup full-fat sour cream
• Vegetable oil
• Salt and black pepper
• 12 oz egg noodles
• chives to garnish