Preheat your oven to 350°F (175°C) and grease an 8x8-inch baking dish with butter or non-stick spray.

In a large mixing bowl, whisk together the eggs and granulated sugar until smooth. Stir in the crushed pineapple, melted butter, and all-purpose flour, mixing until fully combined.

Fold in the bread cubes or crumbs, allowing them to soak up the batter for a few minutes.

Pour the mixture into the prepared baking dish and bake for 35–40 minutes, or until golden brown.

Remove from the oven and cool for about 10 minutes before serving.