Chicken salad makes a good sourdough sandwich with arugula, artichoke hearts, and bacon. Fix the salad up to a day ahead, and assemble the sandwiches shortly before the picnic.
Combine first 5 ingredients in a large bowl. Stir in chicken, artichoke hearts, and bacon. Divide arugula evenly over 4 bread slices; top each slice with 3/4 cup chicken mixture and 1 bread slice.
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