Preheat the oven to 350 degrees.

Combine the sugar, butter, vanilla, milk and eggs and mix. Stir in flour and baking powder. Mix well.

Pour batter into greased and lightly floured 9x13 baking dish. Bake for 25-30 minutes.

Let the cake cool completely by placing it in the fridge for a few hours.

Once the cake is cool, remove it from the baking dish and cut into small chunks and set aside. Next, rinse your blackberries and lay on paper towel.

Begin layering the mini trifle. Start with a layer of cake, next add a layer of fresh blackberries, then a layer of whipped cream. Repeat. Top with whipped cream and some extra blackberries.

Repeat this process with the other trifle dishes.