In a large bowl, add the oil/butter, sugar, eggs, vanilla, almond milk or milk substitute and Optional: Zest and juice from 2 lemons, then mix together using a whisk. See Notes for vegan version for egg substitute.
Add the flour, baking powder, salt to the wet mixture and fold or stir together until just combined.
Add berries and gently fold them in, about 3 - 4 folds and pour into prepared pan. Spread evenly.
Sprinkle the streusel evenly over the batter mixture.
Bake 60-75 minutes until baked.
Once cake is done, after about 10 minutes, take a knife and drag it around the cake and the pan to loosen the cake gently.
Place a plate on the top side of the pan and flip over, then remove pan and replace it with plate you plan on serving it on and it should be streusel crumble side up.