When it comes to choosing a jam for your sunflower cookies, the options are practically endless! Traditional choices include classic raspberry, strawberry, or apricot jams, which complement the buttery cookie beautifully. However, you can get creative and use less conventional fillings like lemon curd, chocolate ganache, or even a fruit compote to add a unique twist. Homemade jam is definitely an excellent option, as it tends to have a fresher taste and can be tailored to your sweetness preference. Just ensure that the jam you choose has a spreadable consistency for easy filling without overflowing during the baking process.