Peanut butter caramel brownie recipe

Ingredients

• 2 tbsp vegetable oil, or other flavourless oil, for brushing
• 350 g caramel sauce, from a can or jar
• 80 g smooth or crunchy peanut butter, ideally no added sugar
• 120 g plain flour
• 75 g unsweetened cocoa powder
• 1 generous pinch of salt
• 1/2 tsp baking powder
• 230 g unsalted butter, softened
• 300 g golden caster sugar
• 3 large eggs
• 1 tsp vanilla extract
• 200 g chocolate chips