3/4 pound penne (I used whole wheat)
1/3 pound green beans, trimmed and cut into 1-inch pieces
3 tablespoons unsalted butter
1 small yellow onion, minced
1 stalk celery, thinly sliced
2 carrots, diced medium
1/4 cup all-purpose flour
2 cups chicken broth
2 cups diced cooked chicken
In a large pot of boiling salted water, cook pasta 3 minutes less than package instructions. Add green beans and cook 3 minutes, then drain.
Meanwhile, in a large saucepan, melt butter over medium-high. Add onion, celery, and carrots and cook until onion is translucent, about 4 minutes. Add flour and cook, stirring, 1 minute. Gradually add broth, stirring constantly, then bring to a boil. Reduce heat and simmer 5 minutes. Stir in chicken and season with salt and pepper. Stir pasta into chicken mixture.