Preheat your oven to 350°F (175°C) and prepare a baking dish.
In a bowl, mix together the flour, sugar, and salt for the crust.
Add the melted butter to the dry ingredients and stir until crumbly.
Press the crumb mixture into the bottom of the prepared baking dish.
Bake the crust for 15 minutes, until lightly golden.
In another bowl, whisk together the eggs, sugar, lemon zest, lemon juice, and baking powder.
Pour the lemon mixture over the baked crust.
Return the dish to the oven and bake for an additional 20-25 minutes.
Remove from the oven and let cool completely.
Dust with powdered sugar before slicing and serving.