Caviar Pie

Ingredients

• ["Nonstick vegetable oil spray", "1 small onion, finely chopped", "1/2 teaspoon sugar", "10 hard-boiled eggs, peeled", "1/4 cup low-fat mayonnaise", "2 tablespoons sweet pickle relish", "1 8-ounce \"brick\"" Neufchatel cheese (reduced-fat cream cheese)