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1
Position a rack in the lower third of the oven and preheat the oven to 350 degrees F. Spray two 13 by 9-inch glass or ceramic baking dishes with cooking spray.
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2
Line each dish with a 15-inch-square piece of parchment paper, allowing the excess to overhang the sides.
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3
Spray the parchment with cooking spray.
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4
For the brownie layer: In a large bowl, blend together the brownie mix, vegetable oil, 1/4 cup water, espresso powder and eggs.
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5
Using a hand mixer, beat for 1 minute on medium speed.
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6
Pour the batter into one of the prepared pans.
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7
Sprinkle with the coconut and bake until a toothpick inserted about 1 inch from the edge of the baking dish comes out clean, 25 to 27 minutes.
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8
Transfer the pan to a wire rack to cool for 1 hour.
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9
Using the excess parchment paper as handles, lift the brownie layer from the pan.
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10
Run a thin spatula underneath to loosen it from the parchment paper.
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11
Keep the oven on.
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12
For the cookie layer: In a medium bowl, whisk together the flour, baking powder, baking soda and salt.
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13
In a stand mixer fitted with a paddle attachment, beat the butter and sugars in a large bowl until fluffy.
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14
Beat in the vanilla and egg.
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15
Add the flour mixture and beat until a dough forms.
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16
Stir in the chocolate chips.
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17
Using your fingers, press the dough evenly into the bottom of the other prepared baking dish, leaving a 1/2-inch border.
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18
Bake until light golden, 14 to 16 minutes.
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19
Transfer the pan to a wire rack to cool for 30 minutes.
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20
Sprinkle the walnuts over the crust.
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21
For the caramel: In a medium, heavy saucepan, combine the caramel candies, 2 tablespoons water and vanilla over medium-low heat.
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22
Cook, stirring occasionally, until the candies have melted and the mixture is smooth, about 10 minutes.
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23
Pour the caramel evenly over the cookie layer.
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24
Working quickly, place the brownie layer on top of the caramel.
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25
Gently press the brownie layer into the caramel.
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26
Refrigerate for 1 hour until the caramel has set.
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27
Allow the layers to come to room temperature, about 30 minutes.
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28
Cut into 24 bars and store airtight in a plastic container.