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Preheat the oven to 350°F, and line jumbo (or regular) cupcake pan with cupcake liners.
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Mix together the cake mix, guava juice, eggs, and coconut oil in mixer; 30 seconds on low, scrape bowl, then 2 minutes on medium.
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Divide the batter evenly in the cupcake liners, to the ⅓ level (no more). Bake for 19-22 minutes, until light golden. Remove from oven, and transfer to a wire cooling rack to cool
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In a medium saucepan, bring the 2 cups guava juice and sugar to a boil over medium heat. Make a slurry of the cornstarch and water. Remove guava juice from heat and stir in the cornstarch mixture with whisk. Return to heat and bring back to a boil, and boil for one minute. Cool in refrigerator.
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Beat cream cheese with mixer until fluffy. Add sugar and vanilla and mix well. Slowly fold in the Cool Whip, and refrigerate until ready to use.
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When cake has cooled, spread cream cheese mixture evenly over cakes. Refrigerate until cream cheese layer sets.
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Glaze the tops of the cakes with guava gel. Refrigerate until ready to serve.