1. Cut the core out of an apple through the stem end, leaving the base intact.
2. Fill the cavity with granola or crumbled oatmeal cookies or granola bars.
3. Sprinkle with cinnamon and wrap well in two layers of foil.
4. Tuck into the embers and turn occasionally for about 10 minutes; when the package is cool enough to handle, unwrap and eat – preferably warm, with ice cream.