01 -
Preheat oven to 190°C and line a muffin tin with paper liners.
02 -
In a large mixing bowl, whisk together flour, baking powder, granulated sugar, cinnamon, and salt until thoroughly blended.
03 -
In a separate bowl, blend whole milk, melted unsalted butter, eggs, and vanilla extract until fully combined.
04 -
Gently fold the wet mixture into the dry ingredients just until the batter forms; avoid overmixing.
05 -
In a small bowl, combine brown sugar and ground cinnamon for the filling.
06 -
Spoon a portion of batter into each muffin liner, swirl in half of the brown sugar cinnamon mixture, then add remaining batter on top.
07 -
Fill each muffin cup two-thirds full and bake for 18 to 20 minutes, or until golden and a toothpick inserted in the centre comes out clean.