For commercial maple butter, see Shopping list - or you can make your own.

1/2 cup butter, softened
Pinch of salt
1/4 cup pure maple syrup

Place butter and salt in the food processor and process until the mixture is light and fluffy. Slowly add maple syrup through the feed tube of the food processor while beating constantly to prevent separation. Continue processing until the syrup is thoroughly mixed through. Store in the refrigerator in a covered container for up to 3 weeks. Thanks to Lyn and Lesley