Preheat oven to 350°F.

Combine filling ingredients, except for chocolate, in a large bowl and toss to coat fruit evenly. Arrange mixture in a 9×13-inch Pyrex dish and cover. Bake for 20 minutes.

Meanwhile, place margarine, potato starch, almonds, and sugar in a bowl and crumble with fingers to create crumbly consistency. Add the oil and mix.

Remove Pyrex dish from oven, uncover, and add small pieces of chocolate to the cooked fruit. Spread crumb topping evenly over the fruit. Sprinkle almonds or pecans on top. Bake for another 20 minutes, uncovered.

Serve warm.