Preheat your oven to 350F. Line a 9x13 inch baking pan with parchment paper and set aside.
In a large bowl, stir melted butter and sugar until combined.
Add eggs one at a time. Ensure each addition is incorporated well.
Add ube extract and stir until evenly blended.
Add mochiko and baking powder and stir until about 80-90% combined.
Add evaporated milk and coconut milk. Stir until incorporated. Ensure your batter is perfectly smooth and has no lumps.
Transfer the batter to your prepared pan and bake for 45 minutes or until a tester inserted in the center comes out with minimal dry crumbs.
Remove from oven and allow to cool completely in the pan before slicing into bars.
