Preheat oven to 375 degrees. Coat an 8-inch-square baking dish with baking spray, or use individual dishes.
Mix together nectarines, brown sugar, cornstarch, lemon juice and salt. Pour into baking dish.
In a medium bowl, stir together flour, oats, brown sugar, baking powder, salt, cinnamon and nutmeg. Add 3 tablespoons of butter into the flour by pinching with your fingers until the butter is evenly distributed in small clumps. Sprinkle topping evenly over fruit. Melt remaining butter and drizzle over the topping.
Bake for 30 minutes, until fruit is bubbling and topping is browned. Let cool slightly before serving.
Nutrition information per serving:
Calories250Fat9 gSodium244 mgSaturated fat6 g