This chapter describes a service learning (SL) project implemented in an upper-level undergraduate "Cost Accounting" course to enhance the coverage of costing concepts. Employing a variation of Lafond, Leauby, and Wentzel (2017) SL task, students actively gather cost data for a business venture by preparing peanut butter and jelly sandwiches which are then donated to a local soup kitchen. Comparison of scores on pre- and post-tests suggests that the SL assignment enhances students' understanding of key cost accounting concepts. More specifically, improvements in mean post-test scores proved significantly greater in the experimental group after completion of the SL activity than in the control group. Feedback further suggests that students appreciated the opportunity to engage in SL by helping others less fortunate. Active SL tied to course objectives meets The Association to Advance Collegiate Schools of Business (AACSB, 2013) suggestions for honing students' critical thinking skills, while also helping to instill SL values in future business leaders. [For the complete volume, "Advances in Accounting Education: Teaching and Curriculum Innovations. Volume 25," see ED671689.]