7 tablespoons unsalted butter, room temperature and cut into chunks
0.75 cup all-purpose flour
0.5 cup rolled oats
1 teaspoon ground cinnamon
0.5 teaspoon ground nutmeg
0.25 teaspoon salt
Steps
Preheat the oven to 375 degrees F (190 degrees C).
Bring a large pot of water to a boil. Submerge nectarines for about 30 seconds. Remove with a slotted spoon and let cool until safe to handle. Peel, halve, remove pit, and slice. Combine sliced nectarines, raspberries, and white sugar in a bowl. Transfer to a baking dish.
Combine brown sugar, butter, flour, oats, cinnamon, nutmeg, and salt in a bowl. Rub between your fingers to create streusel. Sprinkle streusel evenly over fruit.
Bake in the preheated oven until crumble is lightly browned, 45 to 60 minutes.