Cook the sliced mushrooms for 5-7 minutes until soft and slightly browned.
Add the sweet Marsala wine, simmer for about 3-4 minutes.
Pour in the beef broth and let simmer for an additional 5 minutes.
Create creamy perfection by incorporating the heavy cream and simmering for another 5 minutes.
Thicken the sauce by adding the cornstarch mixture, stirring for about 2 minutes.
Season to taste with salt and pepper before serving.
Notes
For added depth, try adding fresh herbs like thyme or parsley towards the end of cooking. This sauce can also be made dairy-free by using coconut cream.