Put the flour, fast action yeast, salt and sugar in a large bowl. Make sure that the salt and the yeast do not directly touch each other. Stir together
In a pan on a low heat, warm up the milk and butter until the butter melts, then add the vanilla extract. Let the mixture cool for 5 minutes or until lukewarm, then whisk the egg into it
Pour the milk mixture into the flour mixture and bring everything together into a sticky dough
Knead the dough for 10 minutes either by hand on a floured surface or in a mixer with the dough hook attachment
Place the kneaded dough in a oiled bowl covered with cling film and leave in a warm place to rise for 1 hour or until doubled in size
Make the cinnamon sugar filling by mixing the light brown sugar with the cinnamon
Roll out the risen dough into a rectangle measuring roughly 40 x 30cm (16 x 12").
Brush the melted butter all over it, then sprinkle the cinnamon sugar all over
Roll the dough into a sausage shape from the longest side, use a sharp knife to trim the ends then cut it into equal pieces. You can mark out the pieces before you cut with a ruler, you want them about 1 inch thick
Place the cut rolls into a lined traybake tin (I used a 12" x 9" one), cover them loosely with cling film and a tea towel and leave them to rise for 1 hour
Pre-heat your oven to 180C Fan/200C/350F/Gas Mark 4
Bake the rolls for 20-25 minutes, until golden brown
After they have cool, mix together the cream cheese, icing sugar and milk, and drizzle it over the buns
Serve immediately, store leftovers in an airtight container for up to 2 days. The buns can be frozen without the cream cheese frosting