Follow the steps in order for the best result.
Preheat your oven to 375°F (190°C). This ensures even baking and a perfectly golden-brown topping.
Prepare a 13x9 inch glass baking dish by lightly greasing it. This prevents the crisp from sticking and makes serving easier.
Slice the fruit into even pieces, removing any pits or seeds if necessary. Arrange the slices in a single layer on the bottom of the prepared baking dish.
In a medium-sized mixing bowl, combine the brown sugar, flour, oats, cinnamon, and nutmeg. These dry ingredients form the base of the crumbly topping.
Add the cold butter to the dry ingredients. Using a pastry cutter or your fingertips, cut the butter into the mixture until it resembles coarse crumbs. The cold butter is key to achieving a tender and crumbly texture.
Evenly sprinkle the crumb mixture over the layer of fruit. Make sure to cover the fruit completely for a satisfying crisp-to-fruit ratio in every bite.
Bake in the preheated oven for 30-35 minutes, or until the topping is golden brown and the fruit is tender. Keep a close eye on it to prevent burning.
The crisp is ready when the topping is nicely browned and the fruit is bubbling. Let it cool slightly before serving.
Serve warm, optionally topped with a scoop of vanilla ice cream or a dollop of whipped cream. Enjoy!