The most extraordinary joyful Funfetti Cookie Cake made by preheating oven to 350°F greasing 12-inch round pan or 9-inch round pan with parchment whisking 2 1/2 cups flour 1 tsp baking powder and 1/4 tsp salt beating 1 cup softened butter and 1 cup sugar medium-high 2 to 3 minutes light and fluffy adding 1 room temperature egg 1 tsp vanilla and 1/2 tsp almond extract mixing well adding flour mixture on low just until soft dough forms gently folding 1/3 cup rainbow jimmies in only 4 to 5 deliberate motions avoiding excessive color bleeding pressing evenly into pan pressing additional rainbow jimmies over top surface refrigerating 20 minutes baking 16 to 20 minutes until edges lightly golden and center slightly soft cooling completely then beating 8 oz room temperature cream cheese and 1/2 cup room temperature butter smooth adding 3 to 4 cups sifted powdered sugar vanilla and cream beating fluffy spreading over cooled cookie cake scattering most generous rainbow jimmies immediately before serving. A completely perfect giant sprinkle funfetti almond vanilla birthday cookie cake recipe.