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Preheat oven to 375 degrees
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Line 8x8 baking dish with parchment & spritz lightly with cooking spray
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In small bowl- combine 1/4 cup sugar & cornstarch - stir in lime juice
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Add blackberries - toss to coat - set aside
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In larger bowl- combine flour, 1/2 cup sugar, baking powder & salt.
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Add egg yolk, vanilla & butter cubes
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Using a pastry tool- work the mixture together until it resembles coarse crumbs
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Spread 2/3 of the mixture into prepared pan - pressing down to even out & flatten
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Top with blackberry mixture - spreading them into an even layer
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Sprinkle remaining crumb mixture over top & then sprinkle with remaining sugar
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Bake for 35-40 minutes or until toothpick test is clean
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Let cool completely before cutting & serving- unless you are serving with ice cream, which is better with a warm bar. Cool about 15 minutes in pan before cutting when serving with ice cream.