
Combine warm milk, water, brown sugar and yeast in a mixing bowl and let it activate for 2 minutes.
Mix melted butter, remaining brown sugar, egg, salt, cinnamon, mixed spice, vanilla, and sultanas. Combine with yeast mixture and add flour.
Knead the dough by hand for 10 minutes or use a stand mixer.
Shape the dough into balls and place in a greased dish. Let rise for 30-60 minutes.
Mix flour and water for crosses. Preheat oven and pipe crosses onto risen buns.
Bake for 15-20 minutes and glaze with maple syrup and water.
Transfer buns to a cooling rack.