Preheat oven to 350 degrees.
Core apples from stem end to ½ inch from bottom. Stuff each hole with 1 tsp jam and butter.
Place in a pan and bake uncovered for 35-45 minutes.
Remove apples let stand for 15 minutes. Set each apple in a bowl and spoon syrup from baking pan around it.
Insert a gummy worm with half its body sticking out.