In a bowl, mix softened cream cheese, sugar, and milk until smooth.
In a separate bowl, whisk together melted butter, minced garlic, condensed milk, a pinch of salt, egg, and parsley.
Slice each bun into six wedges, but do not cut all the way through—keep the base intact.
Transfer the cream cheese mixture to a Ziploc bag and snip off a corner. Pipe the filling between each wedge of the buns.
Brush the garlic butter mixture all over the buns, making sure to get between the cuts.
Place on a baking tray and bake at 350°F for 12–15 minutes, or until golden and crisp.