Preheat oven to 375°F. Lightly spray an 8x8-inch square baking dish with cooking spray. Alternatively, you can use four 5-inch mini cast iron skillets. Set aside.
In a medium bowl, combine the sugar, nutmeg, and cinnamon. Add peaches and blueberries and toss to coat. Pour fruit mixture into prepared baking dish.
To make the topping, in a separate bowl, combine the oats, cereal, flour, brown sugar, butter and cinnamon. Stir to mix well until crumbly. Sprinkle topping over fruit mixture.
Bake 35-40 minutes or until fruit is tender and topping is golden brown. Remove from oven and let cool. Serve with vanilla ice cream, if desired.
Notes
This peach and blueberry crisp can be made with either fresh or frozen blueberries. If using frozen, do not thaw before adding to the fruit filling.