Papaya Oatmeal Squares

Preheat the oven to 350°F (175°C) and prepare an 8x8-inch baking pan by greasing it lightly.

Combine the flour, salt, and brown sugar in a large mixing bowl, stirring well to break up any lumps in the brown sugar.

Cut the butter or margarine into small pieces and add to the flour mixture, using your fingertips or a pastry cutter to work the butter into the dry ingredients until the mixture resembles coarse breadcrumbs.

Stir in the oats until evenly distributed throughout the mixture, then set aside half of this oat mixture to use as the topping.

Press the remaining half of the oat mixture firmly into the bottom of the prepared baking pan to create an even base layer.

Combine the diced ripe papaya, sugar, and lime or lemon juice in a small bowl, mixing gently to distribute the citrus juice and allow the fruit to release its juices.

Spread the papaya mixture evenly over the oat base layer, using a spatula to create a uniform filling.

Sprinkle the reserved oat mixture over the papaya filling, pressing down lightly to ensure even coverage, then scatter the chopped nuts over the top if using.

Bake in the preheated oven for 25 minutes, or until the oat topping turns light golden brown and the filling is set.

Remove from the oven and allow to cool in the pan for at least 10 minutes before cutting into squares and serving.