Dredge the chicken pieces in 1/2 cup flour and season with salt and pepper.
Heat EVOO in a large skillet over medium-high heat and brown chicken pieces on all sides.
Place browned chicken, butternut squash, celery, carrots, onion, sage, thyme, 3 tablespoons flour, salt and pepper. Mix to combine then pour in the chicken broth. Cover and cook, undisturbed, 4 hours on high or 6 hours on low.
Just before serving, add in the peas, Dijon, most of the dill and most of the parsley into the slow cooker. Mix to combine and warm the peas through.
To serve, place a biscuit in each bowl, spoon the chicken mixture over the biscuits and top with a little more dill and parsley.