One Pot Chicken and Mushroom Orzo

Season chicken with 3/4 teaspoon salt and 1/2 teaspoon pepper. Melt butter in a large skillet over medium heat. Working in batches, add chicken to the skillet in a single layer and cook until golden brown and cooked through, reaching an internal temperature of 165 degrees F, about 4-5 minutes per side; set aside. Add mushrooms and shallot, and cook, stirring frequently, until tender, about 3-5 minutes. Stir in garlic and thyme until fragrant, about 1 minute. Whisk in flour until lightly browned, about 1 minute. Stir in chicken stock and Dijon, scraping any browned bits from the bottom of the skillet. Stir in orzo; season with salt and pepper, to taste. Bring to a boil; reduce heat and simmer, stirring occasionally, until pasta is cooked through, about 6 minutes. Stir in spinach, Parmesan and heavy cream until the spinach has wilted, about 3 minutes. Return chicken to the skillet. Serve immediately, garnished with parsley.