In a large saucepan, combine quinoa, cumin and water; bring to a boil. Reduce heat; simmer, covered, until liquid is absorbed, 10-13 minutes. Remove from heat; keep warm., Meanwhile, in a large skillet, heat butter over medium-low heat until golden brown, 3-5 minutes, stirring constantly. Immediately stir in squash and seasonings; cook, covered, until tender, 10-12 minutes, stirring occasionally. Add to quinoa, stirring gently to combine. Top with cheese and, if desired, pine nuts.