The Banana Cake of All Banana Cakes

100g olive oil
1 cup brown sugar
2 eggs
1 cup mashed banana (about 3 bananas)
1/2 tsp pure vanilla extract
2 cups plain flour
3 tsp baking powder
1/2 tsp bicarb soda
pinch salt
1/2 tsp cinnamon
1/2 cup milk
Grease and flour a 20cm springform tin and preheat oven to moderate 180C.
Prepare the crumble topping.
In a separate bowl combine olive oil and sugar then beat in eggs, one at a time. Then add the mashed bananas and vanilla extract.
Sift all dry ingredients together and add to mixture in two batches, alternating with the milk.
Pour into the prepared springform pan and spin to evenly distribute the mixture. This eliminates a cake being higher on on side than the other. Sprinkle the crumble topping over the cake mixture and press it down lightly.
Bake for 45 mins or until cake is cooked through.
Allow to cool before removing from tin.
Crumble topping
35g butter, melted
3 tbsp walnuts, chopped
3 tbsp brown sugar
3 tbsp plain flour
1/2 tsp bicarb soda
1 tsp cinnamon
Mix butter into dry ingredients until well combined. Sprinkle mixture over cake before baking, and press lightly into cake batter.