Can I use chicken breast instead of chicken tenders?
Yes. Pound a boneless, skinless chicken breast to even thickness (about 1/4 inch) before slicing thinly, or slice it raw and cook gently to avoid toughness.
How long should I caramelize the onions?
Typically 25–35 minutes over medium to medium-low heat, stirring frequently. They should turn deep golden brown and become sweet and jammy; don't rush this step.
Can I make this ahead?
Yes. Caramelize the onions and cook the chicken up to 1 day ahead, refrigerated separately. Reheat gently and assemble fresh for best texture on the bread.
What if I can't find cherry peppers?
Substitute roasted red peppers, banana peppers, or jalapeños for a different heat or sweetness profile; adjust quantity to taste.
Should the cheese be melted?
Freshly grated cheddar will soften when piled onto warm chicken and onions; if you prefer it fully melted, top the sandwich and heat in a skillet or under the broiler for 1–2 minutes.