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Decadent Brownie Batter Cookie Sandwiches

brownie batter cookie sandwiches - featured image

Chewy chocolate chip cookies sandwich a rich, creamy brownie batter filling for an indulgent and easy-to-make treat perfect for any occasion.

Ingredients

Scale
  • 1 ¾ cups (220 g) all-purpose flour
  • ¼ cup (25 g) unsweetened cocoa powder
  • ½ teaspoon baking soda
  • ¼ teaspoon salt
  • ½ cup (115 g) unsalted butter, softened
  • ¾ cup (150 g) granulated sugar
  • ¼ cup (50 g) packed brown sugar
  • 1 large egg, room temperature
  • 1 teaspoon vanilla extract
  • ½ cup (90 g) chocolate chips (semi-sweet or milk chocolate)
  • 1 box (about 18 oz / 510 g) brownie mix
  • 4 tablespoons (60 g) unsalted butter, melted
  • 3 tablespoons (45 ml) milk
  • ⅓ cup (40 g) powdered sugar
  • ½ teaspoon vanilla extract

Instructions

  1. Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper and set aside.
  2. Make the cookie dough: In a medium bowl, whisk together the flour, cocoa powder, baking soda, and salt. In a separate large bowl, cream the softened butter with the granulated and brown sugars until light and fluffy (about 3-4 minutes). Add the egg and vanilla extract, mixing until combined. Slowly add the dry ingredients to the wet, mixing just until incorporated. Fold in the chocolate chips gently.
  3. Scoop and bake cookies: Use a tablespoon or cookie scoop to portion out dough balls, placing them about 2 inches apart on the baking sheet. Bake for 10-12 minutes, until edges look set but centers still appear soft. Let cookies cool completely on a wire rack before assembling.
  4. Prepare the brownie batter filling: In a clean bowl, combine the brownie mix, melted butter, milk, powdered sugar, and vanilla extract. Beat with a hand or stand mixer on medium speed until smooth and spreadable (about 2-3 minutes). Adjust consistency with more milk or powdered sugar if needed.
  5. Assemble the cookie sandwiches: Pair cookies by size. Spread about 1 tablespoon (15 g) of brownie batter filling on the flat side of one cookie, then top with its pair, pressing gently to spread filling to edges. Chill sandwiches briefly (15-20 minutes) if filling feels too soft, or serve immediately.

Notes

Use room temperature softened butter for best creaming results. Do not overmix cookie dough after adding dry ingredients to keep cookies tender. Bake cookies until edges are set but centers remain soft for chewy texture. Chill sandwiches briefly if filling is too soft. Cookies can be baked a day ahead and stored airtight. For vegan version, use dairy-free butter substitute, vegan brownie mix, and replace egg with flax egg. For gluten-free, substitute all-purpose flour with gluten-free blend and use gluten-free brownie mix.

Nutrition

Keywords: brownie batter, cookie sandwiches, chocolate chip cookies, easy dessert, indulgent treat, quick dessert, homemade sweets