Pre heat oven to 190c ff
Take a baking tray / sheet pan with sides (see my notes for sizes etc) and pile pumpkin, onion, bacon & tomatoes in the middle of the tray, drizzle over olive oil and mix with your hands to coat, then spread out as evenly as you can (see notes). Bake for 20 minutes.
While the pumpkin mixture is baking, mix together the cream & mustard and set aside.
Meanwhile, cook pasta according to packet directions.
Remove baking tray from the oven, scatter pine nuts roughly over the pumpkin mixture. Now pour the cream & mustard mixture straight on to the baking tray, making sure to get all the mustard on to the tray (see notes).
Bake for a further 2 minutes.
Once finished baking, add pumpkin & cream mixture to the cooked pasta along with the basil leaves and mix everything to coat.
Taste test for salt and pepper at this point and add if necessary, and serve immediately with fresh parmesan.