Make the vinaigrette and Sugared Walnuts three days ahead. Partially bake tart shells and mix the pear-goat cheese filling before guests arrive.
Combine salad greens and cranberries in a large bowl. Arrange mixture on a serving plate. Sprinkle evenly with Sugared Walnuts. Top with 8 Pear-Goat Cheese Tarts. Serve immediately with Champagne Vinaigrette.