Blueberry Batter Cake

This blueberry batter cake is a small miracle of oven chemistry. Fresh blueberries go in the bottom of the pan, cake batter gets poured on top, then a sugar-cornstarch mixture is sprinkled over everything and doused with boiling water. During baking, the cake rises to the surface while the water, sugar, and berry juices sink to the bottom and thicken into a bubbling blueberry sauce.

The boiling water is what makes the whole thing work. It dissolves the sugar and cornstarch on contact, creating a liquid that seeps past the batter and pools beneath it. As the cake bakes, the top sets firm and golden while the bottom stays saucy and spoonable. Lemon juice sprinkled over the berries at the start adds a tart edge that keeps the sauce from being one-dimensionally sweet.

Kitchen Tips

• Pour the boiling water gently and evenly over the top. Pouring in one spot washes a hole through the batter.
• Don’t stir after adding the water. The layers need to separate on their own during baking.
• The cake is done when the top is golden and set but the bottom still looks saucy. It will be jiggly, and that’s right.
• Serve warm, scooped rather than sliced, with vanilla ice cream or whipped cream.

Variations

• Use fresh raspberries, blackberries, or a mixed berry blend instead of blueberries.
• Add a teaspoon of lemon zest to the batter for a stronger citrus note.
• Sprinkle the top with a streusel of oats, brown sugar, and butter before baking for extra crunch.