Delicious Coffee Buns with Crunchy Crust

Name: Delicious Coffee Buns with Crunchy Crust
Prep time: 45 min
Cook time: 15 min
Total time: 1 h
Cuisine: Mexican
Ingredients: Bread Dough; 300g Bread flour (2 cups); 30g Unsalted butter (2 tbsp); room temperature; 200ml Whole milk; lukewarm (3/4 cup 1 tbsp); 5g Instant yeast (1 tsp); 16g Milk powder (2 tbsp); Pinch of salt; Butter Filling; 80g Unsalted butter (Chilled; cut into 10g squares per bun); 65g Granulated sugar (1/3 cup); 1 Large egg; 80g All-purpose flour (2/3 cup); 4g Instant coffee powder (3 tsp); 1 tbsp Hot