What's for Dinner: Crockpot Stroganoff Cube Steak

I've never tried crockpot stroganoff cube steak, so this will be something different for my family. Check back later to find out their review in comments. I'm also combining different ingredients from 2 recipes and adding a twist of my own. So, cross your fingers. Serves 4-6

Ingredients: 

4 cube steaks
1 cup flour
1/4 teaspoon garlic powder 
1/2 teaspoon salt 
1/4 teaspoon pepper 
2 tablespoons olive oil 
1 yellow onion, chopped
6 oz. mushrooms, sliced
1 cup beef broth 
1/2 -1 cup sour cream 
1 teaspoon tarragon 
1 teaspoon Dijon mustard 

Directions:

Heat skillet add 1 tablespoon oil. Cover the steaks on both sides with salt, pepper and garlic powder then dredge through the 1 cup of flour. Add to skillet and brown on both sides. Set aside, Once cooled cut into 1 inch cubes and put into the crockpot. Add the other tablespoon oil to skillet add the onions and mushrooms cook for 5 minutes then add to crockpot. 

In a bowl combine the remaining ingredients, stir then pour over steaks and cook on low for 6 hours. Yum Yum! 

The video below shows an alternative cooking method using the stove instead of a crockpot.