How to Make It
Preheat oven to 400°.
To prepare topping, weigh or lightly spoon flours into dry measuring cups; level with a knife. Place flours and 2 1/2 tablespoons sugar in a food processor; pulse until combined. Add butter; pulse until crumbly. Spread topping on a parchment-lined jelly-roll pan coated with cooking spray. Bake at 400° for 12 minutes or until golden brown, stirring every 5 minutes.
To prepare filling, place nectarines and 3 tablespoons sugar in a large skillet over medium heat; cook 6 minutes, stirring occasionally. Add raspberries, vanilla, and nutmeg; cook 4 minutes or until juices thicken slightly. Remove from heat; sprinkle with toasted topping.