Combine dry ingredients: Mix flour, sugar, salt, and yeast in a bowl.
Mix wet ingredients: Whisk eggs and lukewarm milk together in a separate bowl.
Form dough: Slowly combine wet and dry ingredients, mixing to form a rough dough.
Add butter: Gradually incorporate softened butter into the dough.
Knead dough: Knead on medium speed for 10-15 minutes until glossy and elastic.
Let dough rise: Shape into a ball, cover, and let it rise for 1-2 hours until doubled in size.
Add chocolate: Punch down dough, sprinkle chocolate chips, and gently knead to distribute.
Shape the dough: Divide into three ropes, braid them, and seal the ends.
Prepare for baking: Place the dough in a loaf pan, cover, and let it rise for 45 minutes to 1 hour.
Apply egg wash: Brush the dough with a mixture of egg and milk.
Bake: Preheat oven to 350°F (180°C), bake for 30-35 minutes until golden brown.
Cool and serve: Let cool in the pan for 10 minutes before transferring to a wire rack. Serve warm or at room temperature.