Preheat oven to 200C.
Line your 12 muffins pan.
In a large mixing bowl, add together all the dry ingredients marked *.
Use a whisk to evenly distribute the ingredients.
In a smaller mixing bowl, add the wet ingredient marked ^.
Mix well until combined.
Pour in wet ingredients into dry ingredients.
Mix until just combined, careful not to over-mix or you will get tough muffins.
Fill liners up to 3/4 full.
Add about a tsp of melted peanut butter on top of the batter.
Swirl it with a skewer, knife, or toothpick,
Top with mini chocolate chips.
Bake for 18 mins or until skewer comes out clean.
Allow to cool for 5-10 mins in the pan before transferring to a wire rack to cool completely.