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Preheat oven at 350⁰F/177⁰Grease, line with non-stick paper a 8-inch square pan. Set aside
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In a bowl, using a pastry blender or a fork, combine the flour butter, confectioner’s sugar and white sugar until well blended. Press on the bottom of the prepared pan. Bake for 20 minutes or until lightly browned.
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In a medium sized sauce pot combine mango, sugar, lemon juice, lemon zest, and cornstarch. Cook over low heat until thick. Set aside to cool slightly.
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In another bowl, combine crumble mixture. Set aside.
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Pour cooked berry filling into prebaked crust spread evenly. Dollop crumble on top of the mango filling.
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Bake for 25-30 minutes or until top layer has set.
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Cool slightly on a wire rack. Cut into squares and serve.