1Heat gas or charcoal grill. Meanwhile, in medium bowl, mix Bisquick mix, 1/2 cup of the sugar and the milk; beat 30 seconds.
2In 9-inch round foil cake pan, melt butter on grill over medium heat. Pour batter over butter in pan. Top with nectarine and blueberries. Sprinkle with remaining 1/4 cup sugar and the cinnamon.
3Cover grill; cook about 30 minutes or until toothpick inserted in center comes out clean.