Preheat an oven to 220 C / Gas 7. Mix the salt, white pepper and paprika together in a small bowl; set aside.
Place the chicken into a small roasting tin and sprinkle half of the paprika mixture inside the chicken. Rub the remaining mixture into the skin of the chicken, then set aside.
Place mushrooms into a bowl along with the pate, pistachios, thyme, egg and breadcrumbs. Mix with your hands until evenly blended. Spoon the stuffing into the cavity of the chicken, then tie the legs and wings with kitchen twine. Brush the chicken with half of the melted butter and place into the roasting tin, breast-side down.
Roast the chicken in the preheated oven for 20 minutes, then turn the chicken breast-side up, brush with the remaining butter and continue roasting until no longer pink at the bone and the juices run clear, about 30 minutes longer. An instant-read thermometer inserted into the thickest part of the thigh, near the bone should read 82 degrees C. Remove the chicken from the oven, cover with a doubled sheet of foil and allow to rest in a warm area for 10 minutes before slicing.
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