Toss the sliced plums with 1/4 cup sugar, 2 Tbsp cornstarch, and 1 Tbsp vanilla bean paste. Turn into your casserole dish, skillet, or pie plate and set aside.
Combine the 1/3 cup heavy cream with the 1 Tbsp lemon juice and set aside.
In your food processor fitted with the steel blade pulse to combine 2/3 cup flour, 3 Tbsp sugar, and 1 tsp baking powder.
Add the 6 Tbsp cold butter and pulse/process until the mixture is crumbly with no large pieces of butter remaining.
Add the cream and pulse until the dough comes together.
Take pieces of the dough and flatten slightly with your fingers as you arrange them across the surface of your plums. No need to be precise or neat, and it's fine that some of the fruit shows through. See photos in post for guidance.
Sprinkle the surface with the additional 1 tablespoon of sugar. This gives the surface a nice crispy crackled finish.
Bake in your preheated oven for about 40-45 minutes, or until the top is golden and the fruit is bubbling.
Let cool slightly before serving topped with vanilla ice cream.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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