Cooking appliance muffle (5), which limits a cooking space and at least one groove structure (9, 11) projecting from a muffle wall (8, 10) with a grooved structure surface (19) formed by embossings (22), characterized in that the surface (19) reduces the groove structure (9, 11) in a transverse direction (z) to the muffle wall (8, 10) with increasing distance to the muffle wall (8, 10).
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