With a little care and safety in mind, replacing the Halogen Lamp isn’t such a huge task and very inexpensive, but does require patience.
Work on a clean work surface , so you don’t lose any small parts. Work with a good light
Most Halogen cookers are very similar in construction, disassemble with care noting where all the screws go. If you have never attempted it before, a digital camera is a useful aid, take a picture at each stage, reversing the procedure to re assemble. Note especially if there are many screws of different length, a felt pen is useful to mark for example where the long screws go.
ALWAYS FULLY DISCONNECT FROM THE MAINS ELECTRICITY SUPPLY BEFORE DISASSEMBLING ANY PARTS!
After restoring the oven to working condition