for ROSE’S heavenly CAKES: Chocolate Feather Bed (page 273), i baked on miniature heart “sheet pans”
i call these sheet pans because these are only 1-inch deep. sponge cakes without baking powder bake well on these. these miniature pans are a bit cumbersome to line with parchment, instead, i spray the pans heavily with baking spray. been narrow, miniature pans provide good cake support, so sponge cakes bake as airy as normally turn baked on standard sheet pans that are usually ungreased.
the pans are also available on silicone, which i suspect would work very well.