Preheat oven to 180 degrees celsius (fan-forced). Line a 12 hole muffin tin with paper muffin liners (or grease lightly) and set aside.
Place the butter into the Thermomix bowl and melt for 3 minutes, Speed 2, 100 degrees.
Add the chopped bacon and cook for 3 minutes, REVERSE, Speed 2, 100 degrees.
Add the remaining ingredients and mix on Reverse, Speed 3, 10 seconds. Scrape down the sides of the bowl and mix for a further 5 seconds or until combined.
Divide the mixture between the muffin holes and bake for 15-20 minutes or until golden.
Allow to cool in the baking tin for 10 minutes before transferring to a wire rack to cool completely.