In a stand mixer, mix together butter, sugar and flour. Press into the bottom of a parchment lined 9x13 inch pan.
Bake for 15 to 20 minutes in the preheated oven, or until firm and golden then remove to prepare filling.
For the Filling
Add diced mango and lime juice to heavy duty blender or food processor and puree until completely smooth.
In a medium sized bowl, whisk together granulated sugar and flour to combine dry ingredients. Next, whisk in the eggs, lemon juice, ¼ cup of the prepared mango puree, and vanilla extract. Pour over the baked crust.
Bake for 25-30 minutes or until no longer liquidy or jiggly. The bars will firm up more as they cool.
Once cooled to room temperature, dust with confectioner’s sugar, cut and serve.