To make the crumble, whisk together the flour, sugars, cornmeal, baking powder and salt. Add the butter and use a fork to work the mixture into pea sized pebbles. Place in the fridge to chill while you prepare the other ingredients.
In another large bowl, mix the peaches and blueberries with sugar cornstarch and lemon juice. Pour into a skillet or baking dish.
Sprinkle with chilled crumble and bake for 30-35 minutes, until golden brown and bubbling on the edges. Let cool for 15 minutes before serving. Enjoy with vanilla ice cream and a drizzle of honey if desired.
Notes
*If using frozen fruit, let thaw at room temperature for 2-3 hours before using.