This is a test of commonsense. Complete the next sentence:

How to make spiced feijoa cake
Preheat the oven to 180c/160c convection oven.
Prepare the cake pan with baking paper.
Make the topping.
In a small mixing bowl, mix together a quarter cup of brown sugar , 20 g butter , 1 tablespoon (14. 8 ml) flour and half of the cinnamon.