Melt the butter in a pan over a medium-low heat and fry the garlic for 1 min until softened but not browned. Stir in the cream and mixed herbs, and bring the cream to a gentle simmer, lowering the temperature if necessary. Add the parmesan, stirring continuously until it has melted. Sprinkle over the parsley (you can reserve a little to garnish, if you like). Fold into the cooked pasta and serve.