Egg tart shell, homemade without addition

Ingredients: medium flour, butter, egg, powdered sugar, milk powder, salt, water.
Step 1: Pour the ingredients except butter into the toaster bucket.
Step 2: Make dough.
Step 3: Add 30 grams of softened butter.
Step 4: Knead into a smooth dough as soft as an earlobe.
Step 5: Remove, arrange the shape, reunite again, cover with plastic wrap, put in the refrigerator and relax for 30 minutes.