Beef Stroganoff

Ingredients

• 1 Tbsp. butter
• 2 lb. sirloin steak, cut into thin strips
• 1/2 c. chopped onion
• 2 beef bouillon cubes
• 1/2 c. water
• 1 (10 1/2 oz.) can condensed cream of mushroom soup
• 1 (4 oz.) can mushroom stems and pieces, undrained
• 1/2 tsp. salt
• 1/2 tsp. pepper
• 1 c. dairy sour cream