Very Good. Used my kitchen aid mixture. Did not fold in flour and zest. Just threw it in and blended it a little.
I would definitely recommend folding in the zest and flour. It will allow your batter to stay fluffy. My daughter and I visited the French Pastry School in Chicago and were taught how to make them. The key is to butter and flour every nook and cranny of the madeleine pan, so they come out perfectly shaped showing those deep ridges. If you get the belly bump, that's considered perfect. I never knew that, I thought they were incorrectly done if you had a bump. Well, those are tips straight from the horses mouth. Oh, I used a metal pan from Sur La Table. I'm one of those people who are wary of these non-stick/silicone/caphalon pans/cooking utensils. Its more work, but our grandparents did it, so can we!