Slow Cooker Beef Stroganoff

I decided that I was going to use my Slow Cooker a lot more ( and this gives me more time for Crafty Things).   I made this Beef Stroganoff yesterday and got the thumbs up so I am going to share it with you.
Ingredients-
1/3 cup flour
1tsp salt
1/4tsp pepper
1kg of round steak cut into 1/4 inch strips
1 large onion chopped
1/4tsp garlic powder
1/4 cup tomato sauce
2tsp beef stock powder
400ml can of diced tomatoes
2 cups sliced fresh mushrooms
1 cup light sour cream

Combine flour,salt,pepper in a plastic bag   Place a few strips of steak in at a time.  Shake to coat.   Place in Slow Cooker.  Combine the next 6 ingredients in a bowl and pour over steak.  Cover and cook on low for 6 hours.. Stir in sour cream in the last 30 minutes and serve with rice.  Enjoy.