Preheat the oven to 350F.
Into a 9×9 baking dish line with parchment paper.
Into a large mixing bowl add 1 stick of unsalted butter, 2 tbsp brown sugar, and 2 tbsp of golden syrup. Microwave for 30 seconds then mix, then give it 10 to 15-second jolts back into the microwave until it is fully melted.
Into a medium mixing bowl add a 14 oz can of sweetened condensed milk, 1 cup flour, 2 tbsp cocoa powder, 1.5 tsp baking powder, 2 tsp ground ginger, 1 tsp ground cinnamon, a pinch of salt, and 1 tsp pumpkin pie spice. Mix it together then add to the wet ingredients until fully incorporated.
Bake for 25 minutes or until a toothpick comes out clean. Allow to cool for 6-7 minutes before slicing into squares and enjoying!