Preheat oven to 350°F. Lightly butter an 8x8-inch (or similar) baking dish.
Make the filling: In a medium bowl, gently toss raspberries with 1-2 Tablespoons of sugar and cornstarch. Pour into baking dish.
Make the topping: In another bowl, combine flour, remaining sugar, salt, and egg. Cut in 2 Tablespoons of butter using a fork, pastry blender, or fingers until it forms a crumbly mixture. The dough will be crumbly. Sprinkle all over the raspberries.
Melt the Butter. In a microwave-safe bowl, add 6 Tablespoons of butter and melt in the microwave. Drizzle the melted butter all over the topping.
Bake for 30-38 minutes, or until the topping is golden and the filling is bubbling at the edges. Watch carefully to ensure the topping doesn't get too brown.
Cool for 10-15 minutes before serving to allow the filling to thicken slightly
Serve warm with vanilla ice cream or whipped cream.
Notes
Can I use frozen raspberries instead of fresh? Yes! No need to thaw them. Just increase the baking time by 5–10 minutes and add 2 extra teaspoons of cornstarch to avoid excess liquid.Can I make this ahead of time? You can prep the filling and topping separately, store them in the fridge, and assemble and bake just before serving.Can I add other fruits to this crisp? Absolutely! Raspberries pair well with peaches, blueberries, or blackberries. Keep the total fruit amount the same.