Brown 1/2 cup of unsalted butter. Melt butter over medium high heat until it is completely melted. Lower the heat to medium low and cook until brown bits start to appear at the bottom. Remove from the heat and set aside.
Combine 1 1/4 cup of all purpose flour, 1/2 tsp of baking soda, and 1/4 tsp of salt in a small bowl. Mix and set aside.
Add browned butter, 1/4 cup light brown sugar, 1/4 cup dark brown sugar, and 1/4 cup granulated sugar to a bowl or the bowl of a stand mixer. Mix until combined.
Add the egg and mix for 3-5 minutes until the mixture turns a light brown color.
Add the 1 tsp of vanilla extract, 1 tsp of ube extract, and 1/4 cup of ube halaya. Mix until combined.
Add the dry ingredients from step 2 to the bowl and mix until just combined.
Lastly, add 8 Oreo chunks and 1/4 cup of white chocolate chips. Mix until just combined.
Cover and let the cookie dough chill in the fridge for 30 minutes.
While the dough is chilling, preheat the oven to 350 degrees F (177 degrees C).
Using a medium cookie scoop (~2 tbsp), scoop the dough onto the baking sheet. Make sure they are 2 inches apart.
Bake for 12-14 minutes.
After baking, let the cookies cool on the baking sheet for 10 minutes. Transfer to a cooling rack to cool completely.