A quick and easy economical 3-layer chocolate cake without a mixer, without cream, without chocolate

Cake ingredients
2 eggs
Half a cup of sugar
vanilla
Half a cup of oil
1 cup of milk
pinch of salt
1 and a half cups of flour
3 tablespoons of cocoa
1 tablespoon baking powder

components of the second layer
A quarter cup of sugar
2 and a half tablespoons of starch
1 sachet of creme caramel, you can replace it with an egg
3 cups of milk
1 tablespoon of butter
Half a teaspoon of vanilla

Ingredients for economical chocolate cream
Half a cup of cocoa
A cup but a quarter of sugar
3 tablespoons of flour
A cup and a quarter of milk
1 tablespoon of butter
1 tablespoon of oil
vanilla

Notes We bake the cake at 180 C for 25 minutes
Chinese size 26
Cool each layer before adding the next