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Perfect Spider Web Red Velvet Brownies Recipe with Black Cocoa Swirl

spider web red velvet brownies - featured image

These red velvet brownies feature a dramatic black cocoa swirl creating a unique spider web pattern. Moist, tender, and visually captivating, they are perfect for celebrations and everyday indulgence.

Ingredients

Scale
  • 1 cup (120g) all-purpose flour, sifted
  • 1 cup (200g) granulated sugar
  • 2 tablespoons unsweetened cocoa powder
  • ½ teaspoon baking powder
  • ¼ teaspoon salt
  • ½ cup (120ml) buttermilk, room temperature (or milk plus 1 teaspoon vinegar)
  • ⅓ cup (80ml) vegetable oil
  • 1 large egg, room temperature
  • 1 teaspoon vanilla extract
  • 1 tablespoon red food coloring (gel or liquid)
  • ¼ cup (30g) black cocoa powder
  • 3 tablespoons (45g) butter, melted and slightly cooled
  • ⅓ cup (40g) powdered sugar
  • 2 tablespoons (30ml) milk (add more if needed for consistency)
  • ½ teaspoon vanilla extract

Instructions

  1. Preheat your oven to 350°F (175°C). Lightly grease your 8×8 inch baking pan or line it with parchment paper.
  2. In a large bowl, sift together flour, granulated sugar, cocoa powder, baking powder, and salt. Whisk to combine evenly.
  3. In a separate bowl, whisk buttermilk, vegetable oil, egg, vanilla extract, and red food coloring until smooth.
  4. Pour the wet ingredients into the dry mix and blend gently with a hand mixer or whisk until just combined. Do not overmix.
  5. In a medium bowl, combine black cocoa powder, melted butter, powdered sugar, milk, and vanilla extract. Stir until smooth and pourable, adding more milk if needed.
  6. Pour the red velvet batter into the prepared pan and smooth the surface with a spatula.
  7. Drop spoonfuls of the black cocoa mixture randomly over the red velvet batter in about 10 spots.
  8. Using a toothpick or skewer, create the spider web pattern by dragging lines from the center of each black cocoa drop outward to the edges, then inward between lines.
  9. Bake for 25-30 minutes. Check doneness by inserting a toothpick in the center; it should come out with a few moist crumbs but no raw batter.
  10. Let the brownies cool completely in the pan on a wire rack before slicing to preserve the swirl pattern.

Notes

Use room temperature ingredients for smoother batter and better swirl definition. Do not overmix the batter to avoid dense brownies. Add a teaspoon or two of milk if batter is too thick before swirling. Cool brownies completely before slicing to keep the swirl pattern intact. For a vegan version, substitute egg with flax egg, use plant-based milk, and vegan butter or coconut oil for the swirl.

Nutrition

Keywords: red velvet brownies, black cocoa swirl, spider web brownies, Halloween dessert, easy brownies, chocolate swirl, festive brownies