"Create a celebration dessert called Change Victory Confetti Sheet Cake (9×13) with Salted Vanilla Frosting, inspired by Taylor Swift’s ‘Change.’ Vibe: triumphant, stadium lights, walls falling and confetti raining down.Core (cake): all-purpose flour, granulated sugar, baking powder, fine salt, eggs, milk, neutral oil (or melted butter), vanilla extract, rainbow jimmies (not nonpareils, to prevent color bleed).Frosting: softened unsalted butter, powdered sugar, pinch of salt, vanilla, milk or cream; finish with extra sprinkles.Method: whisk dry; whisk wet; combine to a smooth batter; fold in jimmies; bake in a greased 9×13 pan until golden and springy; cool completely; beat frosting fluffy and spread in bold swirls; shower with sprinkles like ‘confetti.’Include: yield 12–16 slices; total time ~1 hour (plus cooling); exact ingredient amounts; clear doneness cues (toothpick mostly clean, edges pulling slightly); step-by-step; make-ahead + storage (room temp 2–3 days or freeze slices).Swaps: gluten-free (1:1 GF flour), dairy-free (plant milk + DF butter), egg-free (flax eggs), nut-free by default.Plating: tall, golden crumb with thick white swirls and a confetti rain—big chorus energy, no fancy techniques or tools"