1. Char bell peppers over the flames of a gas burner, turning with tongs until blackened and blistered, about 10 minutes. (Alternatively, broil them 2 or 3 inches from heat source.) Transfer peppers to a bowl, cover with a plate, and let stand until cool. Scrape off skins with a paring knife and wipe flesh clean with a paper towel. Keeping stems intact, cut peppers in half lengthwise, then remove and discard seeds. Arrange on a platter and season with salt and pepper.

2. Whisk together anchovies, garlic, vinegar, oil, and parsley in a medium bowl. Add beans and toss to coat. Season with salt and pepper. Spoon over peppers and top with Parmesan and greens.