Start by washing and de-stemming the mushrooms. Save the stems for later. You'll be using them!
Safely cut the mushroom caps and saute them for about 3-5 mins or until tender. You'll start to smell them once they are close to done.
While the caps are sauteing, dice up the onion and stems together in a bowl.
Once the caps are finished cooking, add them to your slow cooker. Add the stems and onions as well and give a little stir.
Start to prepare the fresh thyme and rosemary. Cut up the rosemary leaves, so they are the same size as the thyme leaf. (That smell, though! Heavenly!)
Add the rosemary and thyme mix to the slow cooker and place the lid on. (You're almost there...!)
Now it's time to mix the vegetable base and water together in a bowl. (This is a simple step that the kiddos can help with!) Once done, add to the slow cooker.
Next, add in the cornstarch, salt, pepper, bay leaf, and heavy cream and stir everything all together. (another job for the kids!)
Once stirred, seal the lid.
Turn your slow cooker to high and cook for 4 hours.
Once it's done, give it a quick stir, a sniff (and a tiny taste test - a benefit of being the cook!) and serve!