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Preheat the oven to 375.
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Spray a 9x13 pan with cooking spray. Set aside.
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In a large bowl, add flour, 1/2 cup white sugar, 1/2 cup brown sugar and baking powder. Stir with a spoon. Add salt, cinnamon and ground ginger. Stir.
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Add coconut oil and egg, mix with a fork. Dough will be crumbly. Separate dough in half and press onto sprayed pan. Save other half for later.
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In a medium bowl, add cornstarch, remaining white sugar (1/2 cup). Stir. Add blueberries and lemon juice. Taste to see if more sugar is needed. Add 1 Tablespoon, if necessary.
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Sprinkle blueberry mixture over crust.
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Add remaining crumble mixture, no need to press down. Top with optional toasted coconut.
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Bake for 45 minutes, or until golden brown and bubbly. Cool for 15-20 minutes before cutting.