1. Arrange squash halves, cut sides down, in a microwave-safe baking dish. Add 1 cup hot water; cover with plastic wrap. Microwave at HIGH 15 minutes or until squash is tender. Let stand 3 minutes.
2. While squash cooks, heat a large skillet over medium-high heat. Add 1 tablespoon oil; swirl. Add mushrooms, ginger, and garlic; cook 4 minutes or until mushrooms begin to release their liquid. Add 1/2 teaspoon salt, 1/4 teaspoon black pepper, and spinach, stirring until spinach wilts. Spoon flesh from squash into skillet; stir to combine. Sauté 2 minutes or until liquid evaporates. Spoon mixture into squash halves. Wipe pan clean.
3. Melt butter in a medium skillet over medium heat. Add quinoa flakes and panko; sauté 2 minutes or until toasted, stirring constantly. Stir in 1/8 teaspoon salt and 1/8 teaspoon pepper.
4. Heat large skillet over medium-high heat. Add remaining 2 teaspoons oil; swirl. Add Broccolini and 2 tablespoons water; cook 4 minutes or until crisp-tender. Add remaining 1/8 teaspoon salt, 1/8 teaspoon pepper, and rind, tossing to coat. Cut each squash half in half. Top evenly with quinoa mixture. Serve with Broccolini.