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In a small bowl, mix, using spoon, cookie crumbs, cocoa powder and butter.
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Cover baking pan ( 3 x 7 inches) with baking paper.
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Using your fingers, tap the butter cookies crust into the dish, covering the sides as well ( 1 inch high).
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In a small pot, mix white chocolate chips, water, sour cream and corn starch. Let it boil on medium heat for 2 minutes. Stir constantly.
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Pour the white ganache into the crust.
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When cooled, gently cover with mint jelly.
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Leave to cool for approx. 30 minutes.