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Fudgy Gluten-Free Cosmic Brownies with Vibrant Galaxy Glaze

Two rich, fudgy gluten free cosmic brownies stacked slightly, featuring vibrant, marbled galaxy icing and colorful sprinkles.

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Make copycat gluten free cosmic brownies that are fudgy, moist, and topped with a colorful, crackly glaze. This recipe uses a gluten free flour blend for a safe, delicious childhood treat.

Ingredients

Scale
  • 1 cup (2 sticks) unsalted butter, melted
  • 2 cups granulated sugar
  • 4 large eggs
  • 1 teaspoon vanilla extract
  • 1 cup gluten free all-purpose flour blend (with xanthan gum)
  • 3/4 cup unsweetened cocoa powder
  • 1/2 teaspoon salt
  • 1/2 teaspoon baking powder
  • 1 cup semi-sweet chocolate chips (for extra fudginess)
  • For the Glaze: 2 cups powdered sugar, sifted
  • 3 tablespoons milk (dairy or non-dairy)
  • 1/2 teaspoon vanilla extract
  • Gel food coloring (blue, green, purple, pink)
  • Sprinkles (optional, for decoration)

Instructions

  1. Preheat your oven to 350°F (175°C). Line a 9×13 inch baking pan with parchment paper, leaving an overhang on the sides for easy removal. Lightly grease the paper.
  2. In a large bowl, whisk together the melted butter and granulated sugar until combined.
  3. Beat in the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.
  4. In a separate medium bowl, whisk together the gluten free flour blend, cocoa powder, salt, and baking powder.
  5. Gradually add the dry ingredients to the wet ingredients, mixing on low speed until just combined. Do not overmix.
  6. Fold in the chocolate chips.
  7. Spread the batter evenly into the prepared baking pan.
  8. Bake for 28 to 32 minutes. A toothpick inserted near the center should come out with moist crumbs attached, not wet batter. Do not overbake to keep the brownies fudgy.
  9. Let the brownies cool completely in the pan on a wire rack. This is crucial before glazing.
  10. Prepare the Glaze: In a medium bowl, whisk together the sifted powdered sugar, milk, and vanilla extract until smooth. The glaze should be thick but pourable.
  11. Divide the glaze into four small bowls. Add a different gel food coloring to each bowl (blue, green, purple, pink). Mix each until the color is uniform.
  12. Working quickly, dollop spoonfuls of the different colored glazes randomly over the cooled brownies.
  13. Use a knife or small offset spatula to gently swirl the colors together once or twice to create a marbled or ‘galaxy’ effect. Do not over-swirl, or the colors will blend into brown.
  14. Immediately sprinkle with optional sprinkles before the glaze sets.
  15. Let the glaze set completely, about 1 hour, before lifting the brownies out using the parchment overhang and cutting them into squares.

Notes

  • For the best texture in these moist gluten free brownies, use a high-quality gluten free all-purpose flour blend that contains xanthan gum.
  • If your glaze seems too thick, add milk 1 teaspoon at a time until you reach a good drizzling consistency.
  • To achieve the signature crackle top, avoid adding too much liquid to the glaze mixture.

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