Abstract: A solar oven includes an oven chamber having an open end and an interior cooking chamber. A collapsible reflector assembly, having a plurality of hinged reflective panels, can be folded to a collapsed position for storage or transport, or opened during use to reflect additional sunlight through the open end and into the interior cooking chamber. A transparent door mounted over the open end retains heat within the interior cooking chamber, and a portable frame assembly supports the oven chamber for pivotal movement around a horizontal pivot axis. A ratchet mechanism retains the oven chamber in selected positions around the pivot axis, and a free-swinging, self-leveling tray keeps foodstuffs or cooking utensils level within the interior cooking chamber as the oven chamber is positioned around the pivot axis so as to utilize best the available sunlight.