Preheat the oven to 340°F.
Line and lightly grease a square baking dish.
Mix the milk and vinegar, then set aside for 10 minutes to thicken.
Pour the thickened milk mixture into a large mixing bowl and add the remaining wet ingredients.
Sift in the dry ingredients and gently mix until just combined.
Spread half of the cake batter in the bottom of the prepared pan. Top with the pralines and some extra chocolate chunks.
Cover with the remaining batter and sprinkle some brown sugar all over the top.
Bake for 35-40 minutes, or until the center of the cake is set.