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Wash and dry all produce. Adjust rack to top position and preheat oven to 450 degrees. Butter a 2-quart baking dish (3 quart for 8 servings) - we used 11-x-8-inch for 4 servings and 13-x-9-inch for 8 servings. Arrange bacon in a single, even layer on a baking sheet. Bake on top rack until crispy, 14-18 minutes (15-20 minutes for 8 servings). Meanwhile, halve, peel, and dice onion(s). Trim and discard bottom inch from asparagus; cut stalks into 1-inch pieces. Pick basil leaves from stems; roughly chop half the leaves and discard stems. Reserve remaining basil leaves. Tear ciabatta into ¾-inch pieces.