1.

Heat olive oil in a large pan over medium high heat.

2.

Once hot, add the onion and cook for about 4 minutes.

3.

Add garlic for 2 more minutes, and then mushrooms for an additional 5 minutes.

4.

Remove the vegetables and set aside.

5.

Season the beef with salt and pepper.

6.

Add the beef to the pan, adding more oil if necessary to prevent sticking. Cook for about 5 minutes.

7.

Add the vegetables back to the pan. Then add the stock, worcestershire sauce and dijon mustard. Reduce the heat to medium and cook for about 6 minutes, stirring to combine.

8.

Stir in the greek yogurt and then serve with a low carb pasta or vegetables.