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Flavorful Rhubarb Upside-Down Skillet Cake Recipe with Easy Caramelized Butter Sauce

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A rustic and cozy rhubarb upside-down skillet cake featuring a tangy rhubarb topping and rich caramelized butter sauce, perfect for springtime desserts and casual gatherings.

Ingredients

Scale
  • 1 pound fresh rhubarb, trimmed and sliced into 1/2-inch pieces
  • 3/4 cup granulated sugar, divided
  • 6 tablespoons unsalted butter, divided (softened for batter and rest for caramelized butter sauce)
  • 1 cup all-purpose flour
  • 1 teaspoon baking powder
  • 1/4 teaspoon salt
  • 2 large eggs, at room temperature
  • 1/2 cup whole milk
  • 1 teaspoon vanilla extract
  • 2 tablespoons brown sugar (optional)
  • Zest of 1 lemon

Instructions

  1. Preheat your oven to 350°F (175°C). Set your oven rack in the middle position.
  2. In your skillet, combine sliced rhubarb with 1/4 cup granulated sugar and lemon zest. Toss to coat evenly and let sit.
  3. In a small saucepan, melt 4 tablespoons unsalted butter over medium heat. Add 1/2 cup granulated sugar and 2 tablespoons brown sugar. Stir constantly until mixture turns deep amber and smells nutty, about 4-5 minutes. Remove from heat immediately.
  4. Pour the caramelized butter sauce evenly over the rhubarb in the skillet and spread the rhubarb out evenly.
  5. In a large bowl, whisk together flour, baking powder, and salt.
  6. In a separate bowl, beat 2 tablespoons softened butter with remaining 1/2 cup granulated sugar until fluffy, about 2-3 minutes. Add eggs one at a time, mixing well after each addition. Stir in vanilla extract.
  7. Alternate adding dry ingredients and milk to the wet mixture, starting and ending with dry ingredients. Mix gently with a rubber spatula until just combined.
  8. Pour batter over the rhubarb and caramel sauce in the skillet, spreading evenly.
  9. Bake for 35-40 minutes or until top is golden and a toothpick inserted in the center comes out clean.
  10. Let cake cool in skillet for 10 minutes.
  11. Invert skillet onto a serving plate carefully. Use a spatula to loosen edges if needed.

Notes

Watch caramelization closely to avoid burning; remove from heat as soon as it smells nutty and turns amber. Use room temperature eggs and butter for smooth batter. Don’t overmix batter to keep cake tender. Use a well-seasoned skillet to prevent sticking. Flip cake while hot to avoid breakage. If caramel hardens after cooling, soften with a quick microwave zap.

Nutrition

Keywords: rhubarb cake, upside-down cake, skillet cake, caramelized butter sauce, spring dessert, easy dessert, rustic cake

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