I would explore the route of subcontractors.
That is , if you are a burger joint, have a counter sales subcontractor. All those on the front line and at the window are employed by XYZ company. Those in production work for DEF company. The only people actually on the company payroll are managers.
I know someone who employs a woman to clean their house, once a week, for 3-4 hours, for $100 (cash, no taxes). This woman doesn't appear to stay always for the full time, has many customers, and cleans multiple houses each day. So, if she cleans an average of 3 houses/day, for 5 days/week, this will earn her ~$1,500/week, without taxes. If she works 47 weeks/year, taking 5wks vacation, she will earn ~$70,500/year with no taxes. To earn that equivalent income, with let's say only 20% taxes would require her to make ~$88,000/year if she were part of the visible economy. Most people making close to $90,000/year probably pay a significant amount more than 20% in taxes, so this woman can earn the purchasing power of someone in a job earning $90,000 or somewhat more per year, while working only 5 days/week and taking 5 weeks vacation.
Yes, I know she probably doesn't always have all of her time slots filled etc., but this type of scenario is not far-fetched. People who cut grass, nannies, house-painters, etc. etc., often have opportunities to get paid ‘under the table’.
I am in the IT field as a contractor.
The IRS is already looking at us to make us employees because the companies that contract with us have to much control over the when, what, where, and how of the job.