Anna Olson's Beef Stroganoff

Ingredients

• 1 tbsp olive oil
• 1 tbsp butter
• 1 lb(s) beef sirloin, cut into thin strips
• 2 tbsp all-purpose flour
• 1 cup diced onion
• 3 cup sliced cremini mushrooms (about 1/2 lb mushrooms)
• 2 tsp chopped fresh thyme
• 1 cup chicken or beef stock
• ⅔ cup sour cream (full fat)
• salt and pepper
• ½ package wide egg noodles, cooked
• 2 tbsp chopped Italian parsley