These delicate, buttery shortbread cookies are filled with a vibrant homemade raspberry cranberry jam, perfect for any special occasion.
Ensure all ingredients, especially butter and egg, are at room temperature for best results.
Do not overmix the cookie dough once flour is added, as this can make the cookies tough.
Chilling the dough thoroughly is crucial for easy handling and preventing cookies from spreading.
Measure flour by spooning it into the measuring cup and leveling off to avoid dry cookies.