Prepare the dry ingredients: In a large mixing bowl, whisk together the all-purpose flour, baking powder ... using a hand mixer), beat the room temperature unsalted butter, brown sugar, egg, ube ...

In a medium nonstick saucepan or skillet over medium heat, cook ube halaya with condensed milk until thickened and jammy, 6-8 minutes. Add powdered milk, lime zest, salt and sugar. Continue ...