Hardware:
Very affordable on Banggood/AliExpress/OPENcircuit. For configuration examples see images and/or Fritzing (in the download).

• ESP32 dev kit
• Power supply 140-250VAC to 5VDC, min. 1A
• 2 or 3 relays (voltage and power depending on the fan and  the heating element)
  (the Arduino/ESP relay modules are NOT 250VAC 10A, i don't use modules and use a third true 16A relay)
• 2 momentary buttons
  or use the ESP32 Touch ports
• Red LED
• Resistors: 680Ω (LED), 2 x 20KΩ (NTC),
  2 x 10KΩ or ... (transistor Base)
• 2 transistor S9013 or ...
•  2 diode 1N7004 or ... (used on relays)
• Prototype PCB Board, 11x4 cm
• 2 fuse 16A slow
• Male/female headers and wires as needed
• Maverick ET-73 meat probe
• 2.5mm Stereo jack panel mount (meat probe)

Enclosed PDF in the ZIP-file: Philips AirFryer Service Manual.