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Preheat the oven to 190°C (Gas Mark 4).
Line a muffin tin with muffin cases.
In a large bowl, mix the dry ingredients (sugar, cinnamon, and pieces of apple).
In a jug, mix all the wet ingredients (melted butter, eggs, and buttermilk)
Pour the wet into the dry and stir thoroughly. It will be a slightly wetter batter than you may be used to, that's totally fine!
Spoon the mixture into the cases evenly.
Pop into the oven for around 25 minutes, until you can pierce the muffins with a skewer, and it comes out cleanly.
Serve warm with a brew, or show off your handiwork and take them to the office!