Preheat the oven to 200°C and line a baking tray with non-stick baking paper.
Put the turkey mince in a mixing bowl along with the onion, sage, garlic granules, mustard powder, salt and pepper. Mix thoroughly, until fully combined. Divide the meat mixture evenly into 8 pieces and mould into sausage shapes.
Place the sausages onto the baking tray and cook for 15 minutes. Remove from the oven and leave them until they are cool enough to handle.
Lay a wrap flat on the work surface and brush all over with beaten egg. Spread the cranberry sauce onto the lower section of the wrap. Place two sausages horizontally end to end along the cranberry sauce covered section.
Roll up tightly, making sure you finish with the seam underneath, then cut in half. You can cut the ends off the wrap just to tidy them up a little. Repeat with the remaining wraps and sausage mixture.
Place the sausage rolls seam side down onto the baking tray lined with a clean sheet of non-stick baking paper. Brush each sausage roll with the remaining beaten egg.
Cook in the oven for another 10 minutes, or until they are crisp and golden brown.