I have used chard in the same way one uses spinach, and is interchangeable with it in my opinion.One current favorite way of serving this is something I call a Deep Sea Lunch.
Deep Sea Lunch for 2
1 bunch swiss chard ( any variety), chopped
1 t coconut oil
1 clove garlic, crushed
2 T parmesagn cheese
1 pack moc crab ( you can use equivalent of real crab- I have an allergy)
In a skillet saute the garlic in coconut oil and add the chard. Stir fry till wilted and divide amongst 2 plates. Top each with 1 T Parmesan cheese. Divide the pack of crab between the two plates. Serve and eat.
Makes for a very satisfying lunch !