Can I prepare and freeze these Nutella-filled mini cakes in advance, and how should I reheat them to keep the molten center?
Yes—once baked, let the palets cool, then wrap each one airtight and freeze for up to a month. Reheat straight from frozen in a 180 °C (350 °F) oven for about 8 minutes (or 12 minutes if unbaked batter was frozen), just until the edges are hot and the centers feel soft when lightly pressed; serve immediately so the Nutella stays molten. A quick 20–30 second microwave blast will work in a pinch, but the oven gives the best “lava” effect.
Can I substitute Nutella with another filling (peanut butter, caramel, fruit ganache) and will the baking time need adjustment?
Absolutely—thick, spoonable fillings like peanut butter, dulce de leche/caramel, or a firm fruit ganache work fine; freeze teaspoon-size portions first so they stay centered and molten. The visual doneness cue (edges set, center slightly soft) is the same, so keep the 10–12 min bake, adjusting only ±1 min: shave a minute for very fluid caramel, add a minute for dense nut butter or ganache.
Can I use standard muffin tins instead of mini molds, and how should I adjust the baking time?
Yes—regular muffin cups work; you’ll get about 6 larger palets instead of 12 minis. Keep the oven at 180 °C but extend the bake to roughly 14–16 minutes, pulling them when the tops look dry and the centers still feel slightly soft to preserve the molten Nutella core.