1Heat oven to 450º. Toss bell peppers, onion, zucchini, oil, marjoram and salt in medium bowl to coat. Spread in ungreased rectangular baking pan, 15 1/2x10 1/2x1 inch. Bake 15 to 20 minutes or until crisp-tender. Cool 15 minutes. Cut vegetables into about 1/4-inch pieces.
2Mix 1/4 cup of the cream cheese, the mayonnaise and 2 tablespoons of the nuts.
3Reserve 1/4 cup vegetables for garnish. Place 1 tortilla on serving plate. Spread half of the vegetables over tortilla. Add tortilla; spread with cream cheese-nut mixture. Add tortilla; spread with remaining vegetables. Top with remaining tortilla. Spread side and top with remaining cream cheese. Garnish with reserved vegetables and remaining 2 tablespoons nuts. Refrigerate at least 1 hour. To serve, cut into wedges.