Prepare a delightful genoise sponge cake by delicately blending the ingredients. Pour the luscious batter into a shallow rectangular pan, and with anticipation, place it into the preheated oven set at 350°. Allow the cake to undergo a transformative journey within the heat for a span of 30 to 35 minutes, until it reaches a state of resolute firmness and a mesmerizing golden-brown hue. Once the cake has embraced a cooling respite, commence the artistic endeavor of carving it into a myriad of exquisite shapes. Embrace the freedom of creativity as you fashion the cake into oblongs, squares, rounds, triangles, diamonds, crescents, and other captivating forms. Finally, apply a generous layer of gently warmed apricot jam to infuse the cake with a delightful essence that harmonizes with its sumptuous flavors.