Step 1: 1. Heat the oven to 175c
Step 2: 2. Mix the oil and sugar in a large bowl. Add the eggs and vanilla extract and mix well.
Step 3: 3. Carefully add the cocoa powder, baking powder and flour and mix thoroughly.
Step 4: 4. Grease a baking tin and then fill it with the brownie mixture.
Step 5: 5. Cook in the oven for about 15 minutes
Step 7: These will keep fresh in the fridge for about a week and also freeze well