Preheat oven to 350°. Coat a 9- x 5-inch loaf pan with baking spray.
Combine all dry ingredients (through allspice) in a large bowl.
Whisk eggs, egg white, milk, oil, and pumpkin in a medium bowl until thoroughly blended. Add wet ingredients to the dry ingredients, stirring until just blended. Spread batter into the prepared pan. Sprinkle pumpkin seeds on top.
Bake the bread until lightly browned and a toothpick inserted into the center comes out clean (60 to 65 minutes). Cool in the pan for 10 minutes, then turn out onto a wire rack and let cool for 30 minutes or more.