Preheat oven to 180°C.
Line a muffin pan with paper liners.
In a bowl cream together condensed milk, butter and vanilla.
Mix together milk and vinegar and let it sit for 5 minutes.
In another bowl whisk together flour, baking soda, baking powder and salt.
Now add the milk and flour mixture alternately to the butter mixture and beat until all the ingredients are incorporated.
Mix a tsp of flour to the tutti fruity and mix.
Add it to the batter and fold.
Now with an ice cream scoop fill the liners to 2/3 rd.
Bake for 15-20 minutes or until a tooth pick inserted comes out clean.
Cool the cup cakes on a wire rack and serve.
