Preheat oven to 425°F. Brush baguette slices all over with oil, season with salt and pepper and arrange in a single layer on a large baking sheet. Bake, flipping halfway through, until just crisp, 5 to 7 minutes; set aside. In a large bowl, whisk together lemon juice, maple syrup, salt and pepper to make a dressing. Toss pears in half the dressing and arrange in a single layer on a large, parchment-lined baking sheet. Roast, flipping pears halfway through, until tender and golden brown, about 15 minutes. Toss parsley with remaining dressing. Top each crostini with a piece of ham and then a wedge of pear and few leaves of parsley.
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