There was a family owned & operated BBQ place near me that was pretty good, but closed due to family issues. One of the best things on their menu was a dead simple grilled chicken sandwich with a spicy ranch sauce. It was just the chicken on a toasted bun with the sauce, with optional pickles and sliced onions. The sandwich had 2 secrets:
1) the chicken was perfectly done each time, and it was trimmed to match the size of the bun. I believe the seasoning was simple, probably just salt & pepper AFAIK. Maybe some onion or garlic powder. But it was nicely balanced, and never over seasoned. It didn’t really NEED any condiments, and you COULD get it that way. IOW, whoever was manning that grill knew what they were doing.
2) the ranch sauce was the creation of the husband, who was otherwise not involved in the cooking processes. I lost my taste for ranch dressing beyond 3-4 particular appetizers decades ago, but this became a new exception. I don’t know precisely what peppers he used to give the sauce its kick, but it was either powdered or pureed, because you couldn’t tell it wasn’t straight ranch by looking at it. Like the chicken, the spice mix was perfect. It tasted like plain ranch but after a couple bites, you’d start to feel a certain peppery warmth. But it never got uncomfortable or overwhelming.
I got that sandwich the last half-dozen plus times I ate there (along with their star-shaped brisket & cheese stuffed fried won tons) before they closed.