Making Nectarine Brown Sugar Crisp can be straightforward if you follow these simple steps:

1. Preheat your oven to 350°F (175°C).
2. Prepare the Nectarines: In a large bowl, combine the sliced nectarines, brown sugar, lemon juice, cornstarch, and vanilla extract. Toss until the nectarines are well coated.
3. Transfer to Baking Dish: Pour the nectarine mixture into a greased 9×13-inch baking dish, spreading it evenly.
4. Make the Crisp Topping: In another bowl, combine the rolled oats, flour, melted butter, cinnamon, and salt. Stir until the mixture resembles coarse crumbs.
5. Top the Nectarines: Evenly sprinkle the crisp topping over the nectarine mixture in the baking dish.
6. Bake: Place in the preheated oven and bake for 30-35 minutes, or until the topping is golden brown and the nectarines are bubbling.
7. Cool Slightly: Remove from the oven and allow to cool for about 10 minutes before serving.

These steps will guide you in creating this incredible dessert effortlessly.