Preheat a fan-forced oven to 160C (320F) or 180C (356F) for a conventional oven. Line a cupcake tin with cupcake liners.
In the bowl of a stand mixer fitted with the paddle attachment, add the flour, baking powder, caster sugar and salt. Turn mixer on low speed and allow it to mix for a couple minutes to help everything combine well (alternatively you may do this by sifting the ingredients together). Add the softened butter and let it mix until it resembles a fine sand like texture.
Next, add milk, eggs, yogurt, oil and vanilla extract in a large jug and whisk well.
Add wet ingredients to dry ingredients in a slow and steady stream until no dry ingredients are visible. Scrape down the bowl and mix for another 20 seconds.
Fill each cupcake liner 3/4 of the way (using an ice cream scoop to transfer the batter into the cupcake liners makes this a quick and easy process otherwise you can use two tablespoons).
Bake for 20-25 min or until a toothpick inserted comes out clean. Allow them to cool completely on a wire cooling rack before frosting.
To prepare vodka choc sauce combine vodka and choc sauce together.
To prepare frosting, combine buttercream and kalua together.
Once the cupcakes have cooled down dip the very top in kalua. Let it drip off as much as you can. Core the centre of each cupcake and fill with vodka chocolate sauce.
Fit the end of a piping bag with a Wilton 1M piping tip and frost in a swirl. Finish with a drizzle of salted caramel sauce and two little coffee beans.
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Notes
Cupcakes can be stored in an airtight container for up to three days.