This Martha Stewart-inspired cranberry upside-down cake pairs a buttery, tender vanilla sponge with a jewel-toned topping of tart cranberries and caramelized brown sugar. The fruit bubbles up through the batter as it bakes, creating a glossy, jammy layer that releases beautifully onto the plate. It’s a classic American home-baking showpiece, equally at home at a holiday table or an afternoon coffee break.
Storage: keep the cake covered at room temperature for up to 2 days or refrigerate for up to 4 days. Freezing: wrap individual slices tightly in plastic wrap and freeze for up to 2 months; thaw in the refrigerator overnight. Make-ahead: the topping can be prepared in the pan and refrigerated up to 1 day ahead; bring to room temperature before adding the batter. Reheating: warm slices in a 300°F (150°C) oven for 8 to 10 minutes, or microwave individual slices for 20 to 30 seconds, until just heated through.
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