Sweet Condensed Milk Bread

1 large egg: The egg helps bind the dough together and contributes to the soft texture.
140 g (2/3 cup) milk: Room temperature milk adds moisture to the dough, making it soft and pliable.
30 g (2 1/2 tablespoons) condensed milk: Provides sweetness and creaminess to the dough.
30 g (2 1/2 tablespoons) sugar: For additional sweetness, which helps the dough rise and browns the crust.
5 g (1 teaspoon) salt: Enhances the flavor of the dough.
5 g (1 1/2 teaspoons) instant dry yeast: The leavening agent that helps the bread rise and become fluffy.
300 g (2 1/2 cups) strong flour (bread flour): High-protein flour that helps give the bread its chewy texture.
45 g (3 tablespoons) unsalted butter, softened: Adds richness to the dough and helps create a soft crumb.

60 g (1/4 cup) unsalted butter, softened: Adds richness and creaminess to the filling.
15 g (1 tablespoon) sugar: Balances the richness of the butter with sweetness.
30 g (2 tablespoons) condensed milk: Adds a creamy and sweet texture to the filling, perfectly complementing the bread.

10 g (1 yolk) egg yolk: The egg yolk creates a glossy finish on the bread when baked.
10 g (2 teaspoons) milk: Thins out the egg yolk and helps create a smooth wash for the bread.