What are some cupcake and cookie recipes?

I’m 13 years old and I’m planning to have a bakesale. I want to sell cupcakes and cookies but I’m not sure how to make them. I googled it but I couldnt find a simple vanilla cupcake and chocolate chip cookie recipe. I’m looking for a list of ingredients needed and step by step procedures. Icing? Brownies? Also, im not sure how much I should charge for one cupcake or how much for a couple cookies.
Thank you so much<3

These chocolate raspberry cookie things?

At a Chrismas party, I once had these delicious cookie-like things someone made. The batter was made from fudge cake mix, (but not made like cupcakes) it was spooned into mini paper baking cups and filled or topped with some sort of raspberry filling. Anyone have a recipe for this?
They were made using cake mix, but not as directed on the box. Kinda like cookies, but chewy and baked in mini paper baking cups.
They were not the truffle bars someone suggested, but thanks for trying.