The Method:
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Fire Up the Oven: Preheat your oven to 350°F (175°C). Lightly grease a 9×13-inch baking dish with non-stick cooking spray, or line it with parchment paper for effortless removal later.
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The One-Bowl Mix: In a large mixing bowl, dump in the dry angel food cake mix and the entire can of lemon pie filling. Add your fresh lemon juice or zest right on top.
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Stir Until Foamy: Using a sturdy spatula or a wooden spoon, stir the ingredients together. Do not use an electric mixer; you want to blend them gently. As you stir, you will notice the batter start to react, turning incredibly thick,fluffy, and slightly foamy. Make sure no dry pockets of cake mix remain at the bottom of the bowl.
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Spread and Smooth: Transfer the thick, frothy batter into your prepared baking dish. Use the back of your spatula to smooth it out into an even layer, pushing it gently into the corners of the pan.
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Bake to a Golden Puff: Bake for 30 minutes, or until the top is a beautiful, light golden-brown and the center springs back slightly when gently pressed.
The Ultimate Rule: The Chill Factor
When these lemon bars first clear the oven, they will be incredibly puffed, soft, and fragile. Do not attempt to slice them while they are hot. Let the baking dish cool completely on the counter for about 30 minutes, then transfer it to the refrigerator for at least two hours. As the bars chill, the structure settles and tightens into a dense, delightfully chewy,fudge-like consistency.
Right before serving, dust the top generously with powdered sugar through a fine-mesh sieve, slice them into clean squares using a sharp knife rinsed in warm water, and enjoy a gourmet-tier citrus treat that took virtually no effort to create
