Can I make this without Boursin cheese?
Yes. Use cream cheese or ricotta (about 2 oz) mixed with 1 tsp Italian seasoning and minced garlic instead. Whisk it in with the butter and lemon juice off heat.
How do I prevent the sauce from breaking?
Reserve 1 cup of starchy pasta water before draining. Add it slowly to the butter and cheese off heat, whisking constantly, until you reach your desired consistency.
Can I scale this recipe up?
Yes. Double or triple all ingredients proportionally. Keep the red pepper flakes at 1 tsp per pound of pasta unless you prefer extra heat.
Is this recipe vegetarian?
No. The recipe uses chicken bouillon powder. Replace it with vegetable bouillon powder for a vegetarian version.
Can I make this ahead?
Not recommended. Cook fresh, as the sauce sets quickly. If needed, store leftover pasta in an airtight container for 2 days and reheat gently with a splash of pasta water or cream.