Preheat oven to 375°F and grease a 2-quart baking dish.
Combine fruit, 1/2 to 3/4 cup sugar (depending on fruit tartness), cornstarch, and lemon juice in a bowl. Pour into prepared baking dish.
In another bowl, whisk together flour, 1/4 cup sugar, baking powder, and salt. Cut in cold butter until mixture resembles coarse crumbs.
Stir in cream and vanilla extract until just combined. Drop spoonfuls of dough over the fruit, leaving some gaps for steam to escape.
Sprinkle coarse sugar over the topping if desired. Bake for 35-40 minutes until topping is golden and fruit is bubbling.
Cool for 10 minutes before serving warm.