You can follow the steps below to force quit Fantastic Chefs on Android:
1. Openthe Settings App
2. Choose Applications
3. Select Application Manager
4. Scroll down the running apps and select Fantastic Chefs from the list
5. Tap on Force Stop
6. Select Ok

Another approach to Force Quit the game is by multi-tasking and swiping the game preview right or left to remove it from the recent running list.