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Walmart offers the Coleman Portable Camp Oven [walmart.com] for $ 26.59. Free pickup at store.

Features:
Requires a camp stove as the source for its heat: 1. Center the Coleman Portable Camp Oven over the master burner of your camp stove; 2. Preheat the oven slowly and allow enough time for the desired baking temperature to become stabilized; 3. Place foods, cans or other suitable products in the center portion of the oven and let heat.
Made of smooth, flat aluminized steel
Folds flat for easy portability
Ideal for baking and keeping foods warm while exploring the great outdoors
Comes with an adjustable steel bake rack and an easy-to-read thermometer
Gift idea for camping enthusiasts, hunters, backpackers, and travelers