I want to learn about GMO products that could be sold or cultivated in the European Union.
Is there a list of GMO foods that are allowed to be imported or grown in EU countries?
I think this is the list you are looking for (Genetically Modified Organisms allowed within the EU). The web app allows the filter by category and keywords, but also can provide no filter values and see all products.
Also, this article provides some quick info about how GMOs are handled within the EU.