Preheat oven to 160°C fan / 180°C conventional. Brush the melted butter into the holes of the mini bundt tin, ensuring all the grooves and edges are fully coated. Then coat with flour and tap out the excess.
1 teaspoon Unsalted butter, 1 tablesoon Plain flour
In a large mixing bowl, cream the butter and caster sugar until light and fluffy.
160 grams Unsalted butter or baking spread, 160 grams Caster sugar
Mix in the eggs one at a time until combined.
2 medium Eggs
Fold in the flour and milk to make a smooth cake mixture.
160 grams Self-raising flour, 1 tablespoon Milk
Fold in the vanilla extract and ground cinnamon until combined.
1 teaspoon Vanilla extract, 1 teaspoon Ground cinnamon
Spoon the mixture into a large piping bag and snip off the end. Pipe the mixture into each hole of the bundt tin, filling them just over halfway.
Bake for 15-18 minutes until risen and golden. Leave to cool in the tin for 20 minutes, then carefully remove from the tin and leave to cool on a wire rack.