In a saucepan heat your oil and cook your ground meat until nicely browned. Set aside.
In same saucepan cook your onions and celery adding another drop of oil as necessary. Cook until softened.
Add garlic, mustard, oregano, salt, pepper and cook for about 1 minute stirring continuously.
Then add in your beef broth and tomato sauce stirring until blended.
Finally stir in your cream cheese and stir until melted.
Now you are ready to assemble your meal. Spray your slow cooker with Pam. Spoon in approx. 1 cup of cooked ground meat spreading all over bottom. Add a layer of cooked noodles and then some sauce. Repeat until all ingredients used, finishing with the sauce.
Now alternately you can pour all the meat on the bottom, spread all the noodles on top and then pour the sauce all over (covering entirely) the noodles. Both ways work.
Turn on low. In my slowcooker this meal is done in 3-4 hours.
Your topping (if using) goes on the last 30 minutes of cooking (or until bubbling), just to melt the cheese a little.
During this time you can drink some wine and ask your partner to make a salad!