It’s a little complicated but bear with me:
1. Go into your time machine.
2. Set it for right before he turned on the oven.
3. Hit “start” (your model may say “go” or “enter” etc).
4. Jump in front of him and turn on the oven first.
5. Get back into the time machine.
6. Hit “return” (older models may require you to set the time again – do that first).
Your chicken nuggets can now be eaten from.
You are also responsible for destroying the entire population of the previous time stream. But we are talking about chicken nuggets here , so no expense is to great.