Mix dry ingredients together in a small bowl; set aside.
Cream butter, dark brown sugar and white sugar until smooth. Mix in egg and beat for additional 4-5 minutes.
Add ube jam, extract and food coloring (if using).
Slowly mix in dry ingredients.
Refrigerate dough for at least 4 hours or overnight.
Preheat oven to 325 degrees Fahrenheit.
Roll dough into 1 tablespoon-sized balls and into powdered sugar. Make sure to roll in powdered sugar twice for heavy coverage.
Bake in preheated oven for 10-12 minutes.