Preheat the oven to 350 degrees. Prepare 8 x 8-inch baking pan by buttering it. Set aside.
In a medium bowl combine the dry ingredients for the crust and mix well. Add melted butter and stir to create a dough. Turn dough into the prepared pan and press evenly across the bottom. Bake the crust for 12 minutes and just golden brown. While it’s baking, make the filling.
In a medium bowl, combine sugar, flour and salt. Add the papaya puree, eggs, lime juice, zest and honey. Whisk until the filling appears glossy and smooth.
Remove pan from the oven, pour filling over the hot crust and return to the oven. Bake for an additional 20-25 mins and bars are puffed and firm to the touch in the center.
Allow papaya bars to cool in the pan for at least 30 minutes before running a knife around the edge of the sides. Sprinkle with additional powdered sugar and a grates of fresh lime zest, optional