Preheat your oven to 350°F (175°C) and line a 9×13-inch baking pan with parchment paper.

In a mixing bowl, combine all-purpose flour, granulated sugar, and salt. Cut in cold unsalted butter until the mixture resembles coarse crumbs. Press this mixture into the bottom of the prepared pan and bake for 15 minutes.

In a separate bowl, whisk together the eggs and sugar until smooth. Mix in flour, baking powder, and vanilla extract, then fold in the well-drained crushed pineapple.

Pour the filling over the pre-baked crust, spreading it evenly, and bake for an additional 25-30 minutes until set around the edges.

Let the bars cool completely at room temperature, then dust with powdered sugar before slicing into squares.

Serve chilled or at room temperature, optionally with a scoop of vanilla ice cream.