How to make coffee bun

make a delicious coffee bun. Ingredient (10 minutes) Water 110g, Instant dry yeast 7g, Sugar 35g, Salt 7g, Milk 100g,Bread Flour 350g , Butter 20g Rechargeable: Salted butter 5gx10ea (You may add a little salt to unsalted butter) Mocha Topping: 60g butter, 60g sugar, 70g wheat flour (All-purpose flour), 1 egg, coffee liquid (3t instant coffee powder + 2t water) (use 3 tea bags)