Peel sweet potatoes and chop them into bite-sized pieces. Put them in a pot with a little water, and steam them until tender. Drain.OR, cook whole sweet potatoes in an Instant Pot on a rack with a cup of water, for 12 minutes (10 if you like them a little firm), and allow the steam to release naturally. When they're cool enough to handle, pull off the skins and chop the sweet potatoes up.
Meanwhile, fry or broil bacon until cooked. Remove from fat and allow to cool. Chop.
Combine the mayonnaise, maple syrup, mustard, and salt for salad dressing.
Gently stir the dressing into cooked, drained sweet potatoes until coated. Fold in the bacon and green onions. The salad can be refrigerated for a day or two at this point.
Sprinkle pecan pieces over the salad and serve.
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Notes
The potatoes and bacon can easily be cooked ahead of time.In fact, the whole salad will keep well in the refrigerator if you save the pecans to put on just before serving.