portion 58 an annular lip 59 is formed on the outer surface of the wall 52 and serves to support the oven housing 18 on the side wall 24 of the base 12 a portion 60 of the wall 52 that extends below the lip 59 cooperates with the side wall 24 of the base 12 to restrict the leakage of hot gases such as steam from the cooking enclosure 21 as best seen in fig3 a the portion 60 includes an annular lead in chamfer or relief 61 that serves to guide the portion 60 into the base 12 thereby easing the engagement of the oven housing 18 to the base 12 and preventing the mislocation of housing 18 relative to the base 12 i e the housing 18 can be inserted into the base 12 while being tilted somewhat relative to vertical in one embodiment the oven housing 18 is formed from a suitable transparent polycarbonate material however other material such as glass or even metal may be used as best seen in fig3 and 5 the power head 20 includes an exterior housing assembly 62 the assembly 62 includes a domed shape upper housing 64 having a pair of handles 65 best shown in fig5 and a lower housing 66 including a generally cylindrical wall portion 68 and an annular flange 70 as seen in fig2 four substantially equally spaced lands 72 only one shown are raised from the wall portion 68 to engage a plurality of corresponding ramped tabs 74 formed on the ring portion 58 of the housing 18 to detachably connect the power head 20 to the housing 18 a illustration of the manner in which the tabs 74 engage the lands 72 are shown in fig9 the land 72 engages the tab.