Can I use rainbow chard or regular green chard?
Yes. Rainbow chard is perfect here and looks extra festive. The stems may vary in thickness, so just adjust the sauté time by a minute or two.
What is the best way to prep Swiss chard?
Strip the leaves from the stems. Slice stems thin so they cook quickly, and tear or chop leaves into large, bite-size pieces. Wash well since chard can hide grit, then dry thoroughly (salad spinner or towels) so it sautés instead of steams.
Can I make it dairy-free?
You can. Swap butter for olive oil, use an unsweetened, neutral-tasting oat cream (brand matters) or a rich cashew cream. Full-fat coconut milk also works, but it can add a noticeable coconut flavor. Replace Parmesan with a spoonful of nutritional yeast plus extra salt and lemon. The flavor shifts a bit, but it is still delicious.
How do I keep the sauce from breaking?
Keep the heat at medium to medium-low once the cream goes in, and do not let it hard boil. If it looks too thick, splash in a little broth or milk and stir until glossy again.
Can I make it ahead for a holiday meal?
Yes. Cook the chard and sauce up to a day ahead, refrigerate, then reheat gently. Toast the breadcrumbs right before serving and sprinkle on top.