Sauté the onion until soft.

Season the chicken with salt and pepper, then brown it in a skillet.

Toast the bread and spread mayonnaise on each slice.

Peel and slice the tomato, then add it to the toast.

Add the sautéed onion and top with mixed greens.

Place the chicken tenderloin and roasted red pepper on top.

Skewer an olive on each toast and serve.