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A close up shot of a golden brown rectangle cake with chocolate chips and vanilla buttercream

Rectangle Cake

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5 from 13 reviews

Description

This easy-to-bake rectangle cake combines the comforting texture of a soft-baked cookie with the richness of a classic sponge. Loaded with semisweet chocolate chips and topped with a creamy homemade buttercream, it is a crowd-pleasing dessert designed for effortless entertaining.

Ingredients

  • 7.5 ounces all-purpose flour
  • 1 teaspoon baking powder
  • 1/2 teaspoon baking soda
  • 1 teaspoon kosher salt
  • 3/4 cup salted butter, melted and cooled
  • 3/4 cup dark brown sugar
  • 1/2 cup granulated sugar
  • 1 large egg, room temperature
  • 2 teaspoons pure vanilla extract
  • 1.25 cups semisweet chocolate chips
  • 1/2 cup unsalted butter, room temperature
  • 2 cups confectioners’ sugar, sifted
  • 2 tablespoons milk
  • 1 teaspoon vanilla extract
  • 1 pinch salt

Instructions

  1. Preheat oven to 350°F (175°C) and grease a 9×13 inch rectangular pan, lining it with parchment paper for a clean release.
  2. In a medium bowl, whisk the flour, baking powder, baking soda, and kosher salt until uniform.
  3. In a large bowl, whisk together the melted butter, dark brown sugar, and granulated sugar until it reaches a wet sand consistency.
  4. Whisk in the egg and vanilla extract vigorously for one minute to establish the cake’s structure.
  5. Fold the dry ingredients into the wet mixture with a spatula until just combined, then fold in the chocolate chips.
  6. Pour the batter into the prepared pan, smoothing the top, and bake for 25 to 30 minutes until golden brown.
  7. Cool the cake completely in the pan before preparing the buttercream.
  8. Beat the room temperature butter until fluffy, then gradually add confectioners’ sugar, milk, vanilla, and salt, mixing until smooth.
  9. Spread the frosting over the cooled cake and serve.

Notes

For the best results, ensure your egg is at room temperature to prevent the melted butter from seizing, which creates a smoother crumb. Using dark brown sugar instead of light brown is essential here for that deep caramel flavor and extra moisture that defines this specific bake.

  • Prep Time: 15 mins
  • Cook Time: 25 mins
  • Category: Dessert
  • Method: Baking
  • Cuisine: American

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Find it online: https://cakehalf.com/rectangle-cake/