Use offset spatula to loosen any stuck to parchment. (cookandbemerry.com)
Spoon mousse into prepared brownie base carefully and gently tap pan to remove any large air bubbles; gently smooth top with offset spatula. (hungryrabbit.com)
Using small offset spatula, gently swirl filling into batter using figure - 8 motion, being careful not to drag filling to bottom or edges of pan. (hungryrabbit.com)