Amazing Vanilla Slice Recipe !!!!

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what you need:
Puff Pastry -2 Sheets approximately 25cm x 25cm that’s ready rolled frozen puff pastry
Caster Sugar -1/2 cup
Custard Powder-1/2 cup
Cream -about ½ a cup
Milk – approximately about 1and ½ cups
Vanilla Essence- 1 teaspoon
Butter- about 25gms
Icing Sugar-1 and ½ cup
How to make it ????