Preheat the oven to 350℉ and line the baking dish with parchment paper.
In a large mixing bowl, combine the crushed ½ cup graham crackers, ⅓ cup white sugar, 1 cup all-purpose flour and melted ½ cup butter. Mix well and press into the bottom of the parchment-lined pan. Bake in the preheated oven for 15 minutes.
While the crust bakes, combine the 2 cups sweetened condensed milk, 1 cup full fat coconut milk, ½ cup sour cream, ¾ cup lime juice and 2 tablespoon lime zestin a large bowl. If using, also add the coconut extract and green food coloring. Mix until smooth, then pour on top of the baked crust.
Continue baking for 15 more minutes, then remove from the oven. While still warm, sprinkle on 1 cup sweetened shredded coconut. Chill in the fridge for at least 2 hours to set the filling.
Remove the bars from the pan by lifting out the parchment paper. Slice and serve.
Notes
Store coconut lime bars in the fridge for up to 1 week, covered. They can be frozen individually wrapped in freezer safe plastic wrap for up to 6 months. Thaw in the fridge overnight.
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