In 2-quart microwavable casserole, place butter, onion, garlic, salt and pepper. Cover tightly; microwave on High about 3 minutes or until onion is soft. Add rice; stir to coat with butter. Cover; set aside.
In 4-cup microwavable measuring cup, place broth and water. Microwave uncovered 5 minutes or until hot. Pour into rice mixture; stir. Cover tightly; microwave on High 5 minutes or until mixture is boiling.
Stir mixture; stir in squash. Cover tightly; microwave on Medium (50%) 12 minutes. Stir; continue to cook on Medium (50%) 5 to 7 minutes longer or until rice is just tender and most of liquid is absorbed.
Stir in maple syrup. Top with cheese and sage. Serve immediately.