Using an apple corer, remove each apple's core. Use the corer to carve out a wider hole. Using the tip of a paring knife, score around the middle of each apple. This will help the apples keep their shape while baking.

Preheat oven to 325 degrees F. Place currant jelly in a saucepan, and cook on low heat, letting it thin to a syrupy consistency. Stir in cranberries, letting them barely cook for a minute or so. Stir in 1/2 teaspoon cinnamon and nutmeg. Let mixture cool and become firm.

Press a bit of marzipan into each apple cavity. Spoon in some cranberry mixture. Add more marzipan, then more cranberry mixture and so on until cavities are filled, letting cranberry mixture be on top. Bake 45 minutes to 1 hour, basting every 15 minutes with pan juices, until skins are lightly wrinkled and flesh is soft.

Stir together sour cream, confectioners' sugar and remaining cinnamon; serve this mixture alongside apples.