Spoon the jam into three 6-ounce canning jars that have been sterilized. Fill the jars to within ⅛ inch of the top of the jar. Screw on the lids. Invert the jars for 5 minutes, then reinvert. Let the jam cool to room temperature.
Store the jam in a cool, dark place. Refrigerate the jam once opened; it will keep for several weeks.
This banana jam makes a fabulous topping for Best Ever Banana Muffins.