A lovely, much less expensive pale yellow is Valspar Cream Puff. In a bathroom, you might want to change out the light bulbs near the mirror so you don't look jaundiced.
Farrow's Cream is so delicious. When I was searching for a butter yellow, I was torn between that and F&B's Hay 🧈 I love how different the bathroom feels by just carrying up the butter yellow to the walls. Great job!