Melt the butter
Add flour, powdered sugar, egg and salt together into the butter
Form small balls of dough and place them on tart tins
Mix all the ingredients for making egg custard
Pour egg mixture into custard cups egg tarts
Preheat the oven to 350 F and bake them for 40 to 50 minutes.
Remove the egg tarts from disposable muffin tins (or tart tins)