Preheat oven to 350F/180C.
Add sourdough discard, flours, pumpkin, butter, salt and parmesan to a mixing bowl and bring the ingredients together to form a shaggy dough.
Knead the dough in the bowl until it forms a smooth pliable dough (it is a soft dough and will be slightly sticky, but still very easy to handle). If it's too sticky, add a little more flour.
Using a scale, divide the dough into equally weighted pieces. 20g makes a lovely bread stick, around 27cm long.
Roll each piece of dough into a long, thin stick. If you want to roll in seeds, do that now.
Place the grissini onto a parchment lined baking tray.
Brush them with olive oil and sprinkle with salt.
Bake at 350F/180C for around 25 minutes or until grissini are golden and crisp.
Once baked, leave them in the oven with the door ajar to dry thoroughly.