In a small bowl, combine the ⅓rd cup tutti frutti with 1 tablespoon of all-purpose flour and mix well. Keep aside.
In a large bowl, mix together all the wet ingredients (condensed milk, butter, milk, orange juice, and vanilla extract) using a whisk.
Now sift the dry ingredients (flour, baking powder, and baking soda) onto the wet ingredients and mix gently. Also, add the orange zest to the batter and mix.
Finally, add the dry fruits mixture into the batter and mix gently.
Pour it into a greased and floured loaf pan. I use the pam spray for baking that has butter and flour in it. It works great for me all the time and also gives a nice texture to the crust.
Tap the loaf pan couple of times to even it out. Now spread the 1 tablespoon remaining tutti frutti evenly over the top of the batter.
Bake it in a preheated 360 F oven for about 40-45 mins. Check by inserting a wooden skewer in the center of the cake.
Cool, the cake on a cooling pan. Let it cool completely before slicing.