Standard home recipes frequently dome in the center because heat conducts unevenly through metal bakeware. When you pour batter into two 9-inch round cake pans, the outer edges touch scorching metal while the center remains cool. The edges set first. The liquid batter in the middle keeps expanding upward as trapped gasses expand, producing an unsightly mound that requires extensive leveling.
Professional test kitchens eliminate this problem with two deliberate steps: pan preparation and thermal dampening.
Start by greasing the pans with softened butter, then line the bottom with a tailored circle of unbleached parchment paper. Dust the sides lightly with flour, tapping out every loose grain. For completely flat layers, wrap the pan exteriors with soaked fabric baking strips. These water-saturated bands insulate the metal walls, keeping edge temperatures closer to center temperatures during the first 15 minutes of baking. The entire batter surface rises at the same rate, yielding level tops and clean, pale-golden perimeters.
