Step 4
In the same Dutch oven, heat the remaining 2 tablespoons oil and the butter over medium-high heat. Add the onion, carrots, and celery and cook, stirring, until the carrots begin to soften, about 6 minutes. Add the flour and cook, stirring, until all the flour has been absorbed and darkens a bit, about 5 minutes. Add the strained broth, the chicken meat, and the potato, bring to a boil, then reduce the heat and simmer until the broth thickens, about 20 minutes. Stir in the cream, if using. Season to taste with salt and pepper.