Heat a pan and melt 1/4 cup (57g) butter.
Add the mushrooms. Cook for 3 to 4 minutes.
Add diced chicken, salt, ground black pepper, and sherry. Cook for 3 to 5 minutes.
Meanwhile, heat a sauce pan and melt the remaining 1/4 cup (57g) butter.
Add flour and stir until the mixture forms. Pour in chicken broth and stir until the butter and flour mixture dissolves. Let boil.
Add the broth mixture to the chicken. Stir to combine.
Stir in heavy cream. Add thyme, pimento, parsley, green peas, and ½ tsp chicken powder. Let boil and cook for 2-3 mins.
Serve hot over toast, rice, or pasta.