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In a mixing bowl whisk together graham crackers crumbs and sugar. Pour in butter and stir until evenly moistened. Divide mixture among 8 to 10 dessert cups and lightly press into an even layer, set aside.
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Pour lemon juice and water into a small bowl. Sprinkle gelatin evenly over top, let rest 5 minutes.
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Meanwhile, whip heavy cream in a medium mixing bowl until soft peaks form. Add in ⅓ cup of the powdered sugar, tint with yellow food coloring if desired and whip until stiff (but not lumpy) peaks form (shake cream from beaters, no need to clean).
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In a separate large mixing bowl whip cream cheese until smooth and fluffy. Mix lemon curd and remaining ⅔ cup powdered sugar into cream cheese mixture.
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Heat rested gelatin mixture in the microwave on high power for 30 seconds. Whisk for 1 minute to thoroughly dissolve gelatin, then let cool for 3 minutes (not any longer or lumps will form in mousse).
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While mixing cream cheese mixture with hand mixer, slowly pour in gelatin mixture then blend until thoroughly combined.
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Gently fold ⅓ of the whipped cream mixture into the cream cheese mixture to lighten, then add remaining whipped cream and gently fold until combined.
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Spoon or pipe mixture into dessert cups over graham cracker layer. Cover and refrigerate 2 hours (or up to 1 day ahead if desired) to set. Garnish as desired. Serve cold.