Preheat the oven to 350 f (175C)
Grease and line an 8-inch (20cm) loaf pan with an overhang of baking paper.
In a bowl combine and mix milk and vinegar, Let it sit for 5-10minutes until milk is slightly curdled.
Add oil, sugar, vanilla & pumpkin puree. Mix with a whisk until it is smooth.
In a separate bowl combine all the dry ingredients ( flour, corn starch, baking powder, baking soda, cinnamon, all spice and salt).
Mix dry ingredients with the liquid ingredients using a hand whisk to form a smooth batter.
Pour the batter into the prepared loaf pan.
Add a thick layer of unbaked crumb topping and bake until it is golden brown which takes about 35-40 minutes approx. (*test the middle of the bread with a toothpick*).
Cool it down for 45 min.
Drizzle melted Biscoff spread all over the cake. Enjoy!