Preheat your oven to 350°F (175°C) and prepare your baking pan by greasing it and lining with parchment paper.

Combine flour, sugar, and salt in a mixing bowl. In another bowl, whisk melted butter and eggs, then mix with dry ingredients.

Spread the crust mixture evenly in the prepared pan and bake for 15–20 minutes until lightly golden.

In a separate bowl, whisk together sugar and cornstarch, then add orange juice, zest, eggs, and vanilla; mix until smooth.

Pour the filling over the baked crust and swirl gently, then return to the oven for 25–35 minutes until set.

Allow the bars to cool completely in the pan on a wire rack.

Whisk together powdered sugar, orange juice, and zest to make the glaze.

Once cooled, glaze the bars and let set before slicing into squares.