In a small oven
Place cooked blueberries in a greased oven, I use ones I pick and cook at home then keep in the freezer until I need them.
Cook over low heat until bubbly. Mix a yellow cake mix and pour over top of berries. Place over low heat for 20 min then add hot coals on top of the lid. Cook until cake is done about 20 min. check often as this will burn very easy.
Cobbler in the small oven, beef roast in the large oven