Melt butter to a large heavy skillet over medium high heat.
Once melted and foamy add the mushrooms and cook until browned, about 5-7 minutes. Add the onion and cook for another 3-4 minutes until softened and browned. Add the garlic and cook for 30 seconds more.
Stir in the flour and cook for 2 minutes.
Carefully whisk in the wine, chicken stock, chicken base, thyme, salt and pepper until fully combined and bring to a boil. Boil the sauce for 3 minutes, reduce the heat to a simmer and whisk in the heavy cream. Taste for seasoning and adjust. If the sauce is a little thicker than you'd like, you can whisk in a little more broth.
Add in the peas, pimentos and chicken and simmer until heated through. Taste and adjust seasoning as needed. Serve over egg noodles, biscuits or mashed potatoes.
Notes
Store leftovers in an airtight container in the fridge for up to 5 days. To reheat, add an extra splash of broth or cream to help thin it out.
You can use whatever leftover chicken you have. This is the perfect recipe to use up leftovers or a store bought rotisserie chicken. You could also roast or poach 2-3 chicken breasts or about 1 pound of chicken tenders for this recipe.
There is no need to thaw the peas before adding them into the sauce.
This is delicious served over any starch. Noodles, biscuits, mashed potatoes or rice are excellent options.
White wine can be substituted for more chicken stock.
Low sodium chicken stock helps you control the level of salt in your dish. Using low sodium broth and stock is always my preference.