The Holiday (Thanksgiving, Christmas, or Fancy) Dinner Budget STEM activity is an engaging, no-prep, and editable Google Sheets activity/project designed to enhance financial literacy and coding skills. This versatile and completely editable template allows students to plan a dinner within a set budget, and is preset with 3 differentiated levels. The sheet includes essential components like budget setting, an ingredient list, and premade themes for holidays such as Thanksgiving and Christmas while remaining fully editable. Students can track spending using built-in calculations while practicing comparison shopping skills. Teachers can easily modify the template to suit specific classroom needs. The activity's adaptability extends to subjects like history, geography, and science, making it a powerful tool for integrating financial literacy across various grade levels. Extension activities, such as comparing budget scenarios, further enhance the learning experience. This comprehensive activity provides students with practical, real-world skills in an engaging, customizable format.