How to get the BUSINESS MIMIC with ONLY CHEF | Tower Heroes 

Waves 1-4 | Place all 12 Level 1 Chefs, from back to front.
Waves 5-9 | Upgrade all of them to Level 2, from back to front.
Waves 10-16 | Upgrade the Chefs to Level 3, again from back to front.
Waves 16-22 | Up
Waves 23-25 | Upgrade the last 3 Chefs at the back to Level 5.
Wave 25 | Once the first Chefs are out of range, sell one and upgrade the Chef closest to the back to make sure you kill the boss.