Slow-Fashioned Potpie with Biscuit Crust

This was a huge success!!! I increased the onions, carrots, and sauce ingredients by 50% because I cooked it in a 6 quart slow cooker. I also increased the green peas to 1 cup, added 8 ounces of quartered cremini mushrooms, and 1.5 cups of Quorn chik'n tenders. I cooked the filling in the slow cooker for 5 hours on low. Then I transferred it to a casserole dish, added the biscuit topping and cooked it in the oven at 375 degrees for 30 minutes. It was perfect! I will certainly make this recipe again.