Why is My Custard Lumpy?
If you find that your custard is lumpy rather than being smooth, it is likely because it wasn’t whisked frequently enough. When you are making the custard, make sure you continuously whisk the mixture until it is thickened. You custard may also become curdled if you are cooking it over too high heat. The best heat level to cook custard over is around medium.
How Can I Correct Curdled Custard?
If you find that your custard has curdled, you may be able to save it. Simply pour the mixture through a fine-mesh sieve which will remove the curdled bits from the custard.
Can I Add Fruit to Cookie Trifle?
Yes, if you enjoy a traditional English trifle and would like to add fruit, you can definitely do so. The best types of fruit to pair with chocolate are cherries or berries like blueberries, blackberries, or strawberries.
How to Store Cookie Trifle
This cookie trifle can be covered with plastic wrap and stored in the fridge where it should keep for at least 4 to 5 days.
Ingredients
How to Make Cookie Trifle

Whisk the egg with the sugar, salt, vanilla, flour, and cornstarch in a pot set on the stove until combined.

Whisk in the milk and continue cooking, while whisking, until thickened.