Set the pot to saute and add the butter and olive oil. When the oil is hot add the onion and fry until softened (around 3 minutes).
Add the garlic, basil, oregano and thyme followed by the chicken. Fry until the chicken is roughly browned.
Season to taste and then add the pasta, cream and stock.
Put the lid on the instant pot and set on high pressure for 4 minutes. leave under pressure for another 4 minutes and then do a quick release.
Remove the lid and stir everything together. Set the pot to saute. Remove around 5 tbsp of liquid and add to the cornflour in a bowl. mix well together and stir back into the pot.
Add the lemon juice/zest and parmesan. Bring to the boil whilst stirring occasionally until the sauce has thickened (around 2 minutes)
Serve with a garnish of parsley and enjoy.