Creamy Chicken and Noodles - With legumes

1 tablespoon olive oil 6 boneless skinless chicken thighs 1 tablespoon butter 1 small yellow onion , chopped 3 carrots , chopped 2 celery ribs , chopped 6[...]

8 ounces broad egg noodles 3 tablespoons vegetable oil 1 1/4 cups water 1 onion , chopped 1 garlic clove , minced 3 tablespoons flour 1 3/4 cups milk 2[...]