Step 1

Preheat oven to 180 C (350 F) standard / 160 C (320 F) fan-forced. Grease and line an 8-inch square baking tin with baking or parchment paper, ensuring two sides overhang.

Step 2

In a large mixing bowl, add melted butter. Then add peanut butter, sugar, vanilla and eggs and gently whisk together.

Step 3

Add flour and baking powder. Stir until smooth batter forms. Add chocolate chips and marshmallows and stir again.

Step 4

Pour blondie batter into prepared tin, smooth the top and place in the oven. Bake blondies for approximately 30 minutes or until golden on the edges and a skewer inserted in the middle comes out clean.

Step 5

Leave in pan to cool completely – blondies will firm up as they cool. Cut into squares to serve.