Preheat the Oven
Preheat your oven to 350°F (175°C). Line a 9×9-inch baking pan with parchment paper for easy removal.
Make the Crust
In a large bowl, combine the flour, granulated sugar, brown sugar, salt, and baking powder.
Add the melted butter and mix until the texture becomes crumbly.
Press ⅔ of the crumb mixture evenly into the prepared pan.
Bake for 15 minutes, or until the crust is lightly golden.
Prepare the Lemon Filling
In another bowl, whisk together the sweetened condensed milk, egg yolks, heavy cream, and salt.
Slowly whisk in the lemon juice until smooth and fully combined.
Assemble and Bake
Pour the lemon filling over the hot crust.
Sprinkle the remaining crumb mixture evenly over the filling.
Bake for 15–20 minutes, or until the top is golden and the filling is set.
Cool and Chill
Let the bars cool completely at room temperature.
Refrigerate for at least 4 hours before slicing and serving.
Notes
Store in an airtight container in the refrigerator for up to 5 days.
Can be frozen in an airtight container for up to 3 months; thaw in the fridge before serving.
Dust with powdered sugar before serving for a pretty and sweet finish.