I think there are definitely a few different ways you can write your resume to showcase skills other than cooking, because cooking has many "shoot-off" skills such as time management, management in general, cleaning, maintenance (fixing things around the kitchen), organization, execution, creativity, experience, persistence, reliable, motivated, there are many different words to describe all aspects of what a chef does. Skills that can pertain to other jobs. People switch fields all the time. You just have to really showcase your skills and make them fit into other areas related to the specific job you're applying for.

For example, my last job was in customer service. I had to really tailor my resume to closely match the skills required for the job I was applying for even though it didn't have to do with customer service. I think the fact that you've had a job for 15 years shows how reliable you are to employers right off the bat. Focus on your assets and what you bring to the table (pun intended). Make your profile interesting and highlight your skills using the words I mentioned.

Kitchens work like a crew on a ship, the head chef is the captain but the captain would never reach his destination without his crew. Each chef is a manager to the other chef. Working like a cohesive machine. Mention your managerial qualities. Your leadership qualities. Fast and independent worker who pays great attention to detail, producing top quality work with extensive time management skills. Write something like that, and apply for all types of jobs in different fields. Someone will realize the importance of your experience.