Start by preheating your oven to 350°F (175°C). Prepare an 8x8 inch baking dish by greasing it lightly. In a mixing bowl, combine the melted butter, sugar, and eggs, stirring until well mixed. Gradually add in the flour, baking powder, and salt, mixing until combined but taking care not to overmix.
Next, fold in the kiwi puree gently into the mixture until evenly distributed. Pour this delightful mixture into your prepared baking dish, smoothing it out evenly.
Bake in the preheated oven for about 30 minutes, or until the bars are set in the center and lightly golden on the edges. Allow them to cool completely before slicing into squares.
Notes
These kiwi bars are best served chilled, and they make for a refreshing dessert at any gathering.