Everything took hours to make, but the runny gravy waters everything down as much as it adds flavor. A cooking slurry of water and either cornstarch or fluffed flour can thicken things up ...
You can whisk more into your gravy as you build it and adjust the consistency as desired without the risk of it clumping or tasting like flour. What's the Difference Between Wondra and Cornstarch?
In a small bowl, combine 1 cup of the chicken broth with cornstarch; stir until dissolved. Add to vegetables. Add the remaining 3 cups chicken broth, Gravy Master, dissolved beef bouillon ...