01 -
Preheat oven to 350°F (175°C). Line a 9-inch square baking pan with aluminum foil and lightly coat with cooking spray. Combine cookie crumbs and melted butter in a bowl until moistened. Press mixture firmly into the pan bottom. Bake for 14 minutes until edges are slightly golden.
02 -
Whisk sugar, salt, and lemon zest in a bowl. Add lemon juice and eggs, whisking until smooth. Once the crust is baked, pour the filling over it. Bake for 18-22 minutes or until the filling is set at the edges but slightly jiggly in the center. Cool at room temperature, then refrigerate for at least 3 hours.
03 -
Bring 2 inches of water to a simmer in a saucepan. In a heatproof bowl over the saucepan, whisk egg whites and sugar constantly for 5-7 minutes until the mixture reaches 140°F (60°C) and sugar dissolves. Transfer to a stand mixer and beat on medium-high for 5-7 minutes until thick, glossy peaks form.
04 -
Lift the chilled bars from the pan using foil overhang. Spread meringue over the top, shaping peaks and swirls. Use a torch to lightly toast the meringue or broil for 1-2 minutes while watching carefully. Slice into squares with a hot, clean knife and serve immediately.