Heat oven to 400. Spray a 9" x 13" baking dish w/ cooking spray. In bowl combine, 1 cup sugar, cornstarch, 1 tsp cinnamon and nutmeg. Stir in peaches and blueberries and lemon juice. Spoon into pan, cook 15 mins. Remove from oven.
In bowl, whisk together flour, 6 tbsp sugar, baking powder and salt. Cut in butter until crumbly. Stir in milk until a soft dough forms.
Combine in small bowl, 2 tbsp sugar and remaining cinnamon. Drop dough over fruit by tbsp. Sprinkle w/ cinnamon sugar mix. Bake 30 mins, or until top is browned.