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In the USA , vanilla comes in a liquid bottle
Baking powder comes in a small container

1packet is 1tsp. So for this recipe 1/2 tsp

Vanilla and baking powder don't come in packets here. Vanilla is a liquid in a bottle and baking powder comes in a can. How much of each do you mean??

You don't say self raising flour or plain

What is a “packet” of baking powder? A teaspoon? A tablespoon? More? Less?

Porfavor en español la receta.