Peel garlic and mince

Whisk with olive oil, vinegar and mustard to make the dressing

Season to taste with salt and pepper

Trim chicken breasts and pound between two sheets of plastic wrap to an even 1/2-inch thickness

Pour 1/4 cup dressing over chicken and let stand 30 minutes

Grill chicken 4 minutes per side

Cool and cut into large dice

Coarsely chop lettuce and transfer to a large bowl

Cut tomatoes into 4 wedges and scoop out the seeds

Cut into medium dice

Place corn on a dish towel and cut off kernels

Chop olives, basil and parsley

Cut the pepperoni into medium dice and toss all with lettuce and remaining dressing.