Set Power Select at MEDIUM-LOW.
Cream together shortening and sugar; stir in egg and milk.
Add flour, baking powder and salt, stirring only until flour is moistened.
Divide 1/2 batter into 6 custard cups (6 oz ea lined with cupcake paper; spoon 1 teaspoon jam into center of each.
Top with remaining batter, spreading to cover jam.
Arrange dishes in circular pattern on glass oven tray.
Heat 5 to 6 minutes; let stand, covered, 3 minutes.
Dip tops of muffins in butter, then in cinnamon sugar.
Store, covered, until ready to serve.