In small bowl, stir together cream cheese and 4 teaspoons of the pesto. Spread cheese mixture over pie crust to within 1 inch of edge. Arrange spinach evenly over cream cheese mixture. Sprinkle onion over spinach. Arrange tomato slices in single layer over onion. Carefully fold 1-inch edge of crust over filling, pleating crust every 2 inches. Brush remaining 1 teaspoon pesto over edge of crust.