Step 1

Preheat oven to 200C/390F (all ovens) (Note 6). Line a 12 hole muffin tin with paper patties.

Step 2

Whisk flour, baking powder, baking soda, sugar and salt in a bowl. Stir through chocolate chips.

Step 3

In a separate bowl, whisk buttermilk, melted butter, oil, eggs and vanilla.

Step 4

Make a well in the flour bowl, pour in egg mixture. Mix until just combine - try not to stir more than 8 times. Some flour lumps in the batter is fine.

Step 5

Divide batter between paper cases. Top with remaining 1/4 cup chocolate chips.

Step 6

Bake for 5 minutes, then turn down to 180C/350F (fan forced/convection) and bake for a further 15 minutes, or until a skewer inserted into the muffin comes out clean.

Step 7

Remove muffins from the muffin tin immediately onto a cooling rack.

Step 8

Serve warm or at room temperature (warm is extra yum!)