Pre-heat oven to 350F.
Roll out the defrosted phyllo pastry and cover with a damp clean kitchen towel so they don't dry out. Keep a large rectangular 10x7 baking dish beside you.
Accordion fold the pastry sheets one at a time and place in the baking dish side by side till the dish is full. You should have enough pastry to fill the dish without them being too cramped.
Bake for 10 minutes at 350F.
Meanwhile, while the phyllo bakes, melt 1 cup of butter.
Take the phyllo out of the oven when the 10 minutes are up, and pour the melted butter all over. Return to the oven for another 10 minutes.
While the phyllo bakes, in a large mixing bowl mix together the milk, eggs, vanilla, and sugar (and any other flavours you want to add). Mix well.
When the phyllo is out of the oven pour the custard over the baked phyllo so it is evenly distributed. Return to the oven for 30-35 minutes.
While the phyllo is baking, make the simple syrup. In a small saucepan mix together 1 cup water with 1 cup sugar and 1-2 tsp lemon juice. Allow to come to a boil and stir till the sugar is dissolved. Turn off the heat and set aside to cool.
When the crinkle cake comes out of the oven, drizzle with simple syrup, and/or any other flavour toppings you like (see above). Slice and serve! I prefer this served warm, but it also does well at room temperature. Enjoy!