The present application in particular is directed to an oven muffle (1) comprising a lighting system (3). The lighting system (3) comprises a light source (6) and a light guide (4) attached to the outer surface of the oven muffle (1), the light guide (4) has at least one light guiding tube (4) arranged and adapted to couple light of the light source (6) into the light guiding tube (4), wherein the light guiding tube (4) extends in parallel to the light guiding direction along a respective wall (5) from a light tube exit window to its light tube face side, preferably lying beyond a respective edge of the wall (5).