Preheat oven to 450°. Cut each squash lengthwise in half; remove and discard seeds. Lightly brush cut sides with 1 teaspoon oil; sprinkle with pepper and 1/2 teaspoon salt. Place on a baking sheet, cut side down. Bake until tender, 15-20 minutes., Meanwhile, in a large saucepan, combine broth and quinoa; bring to a boil. Reduce heat; simmer, covered, until liquid is absorbed, 12-15 minutes., Stir in garbanzo beans, cranberries, green onion, sage, lemon zest, lemon juice and the remaining oil and salt; spoon into squash. Sprinkle with cheese and pumpkin seeds.