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Slime-Filled M&M Cookies Recipe

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4.2 from 9 reviews

Delight in these fun and colorful Slime Filled Cookies, packed with chocolatey richness, vibrant M&M candies, and a gooey neon green frosting core that oozes slime-like with every bite. Perfect for parties or Halloween treats, these cookies combine a luscious cocoa dough with a playful surprise inside.

Ingredients

Cookie Dough

  • 1 Cup Sweet Cream Unsalted Butter
  • 3/4 Cup Sugar
  • 2/3 Cup Packed Brown Sugar
  • 2 Large Eggs
  • 1 tsp Vanilla Extract
  • 2 1/4 Cups Flour
  • 2/3 Cup Unsweetened Cocoa Powder
  • 1 tsp Baking Soda
  • 1/4 tsp Salt
  • M&M Candies (orange, green, and purple, divided)

Frosting and Filling

  • 16 oz White Frosting (one container)
  • 5 drops Neon Green Gel Food Coloring

Instructions

  1. Preheat and Prepare Pans: Preheat your oven to 350°F. Line a cookie sheet with parchment paper or a non-stick silicone baking mat to prevent sticking and ensure even baking.
  2. Sort Candies: Separate the green, orange, and purple M&M’s into a small bowl for easy incorporation and decoration.
  3. Sift Dry Ingredients: In a mixing bowl, sift together the flour, baking soda, salt, and unsweetened cocoa powder. This ensures an even distribution and removes lumps.
  4. Cream Butter and Sugars: In a separate large mixing bowl, use an electric mixer to cream the sweet cream unsalted butter with both the granulated sugar and packed brown sugar until the mixture is light and fluffy.
  5. Add Eggs and Vanilla: Add the large eggs one at a time along with the vanilla extract to the creamed butter and sugar. Continue mixing until well combined.
  6. Combine Wet and Dry: Gradually add the sifted dry ingredients to the wet mixture, mixing slowly as you go until a smooth cookie dough forms.
  7. Mix in Half the M&M’s: Gently fold about half of the sorted M&M candies into the cookie dough to distribute colorful bursts throughout each cookie.
  8. Shape Cookie Dough Balls: Scoop and shape the dough into roughly 2-inch diameter balls for consistent cookie size and even baking.
  9. Decorate with Remaining M&M’s: Press the remaining M&M’s firmly into the surface of each cookie dough ball for a vibrant, candy-studded appearance.
  10. Bake Cookies: Place the cookie dough balls on the prepared baking sheet and bake at 350°F for 9–11 minutes. Once baked, allow them to cool slightly on the baking sheet before transferring to a wire rack to cool completely.
  11. Prepare Frosting Filling: Scoop the white frosting into a microwave-safe bowl and gently heat it for 15 seconds to soften, making it easier to inject.
  12. Color the Frosting: Stir in 5 drops of neon green gel food coloring until the frosting achieves a bright and vivid green color, perfect for the slime effect.
  13. Fill Flavor Injector: Place the needle of a flavor injector into the bowl of green frosting and pull the knob to fill the injector with the slime-like frosting.
  14. Inject Cookies: Poke the side of each cookie with the injector needle and slowly inject the green frosting inside just until the cookie surface cracks slightly, creating a slime-filled surprise.
  15. Repeat for All Cookies: Continue injecting each cookie until all are filled with the neon green frosting. Enjoy immediately or store in an airtight container.

Notes

  • Ensure the frosting is softened but not melted for easy injecting and to avoid overly runny filling.
  • You can substitute M&M’s with other colorful candy pieces if desired.
  • Use a flavor injector or a pastry syringe for the filling step to achieve the best slime effect.
  • Allow the cookies to cool completely before injecting to prevent melting the frosting inside prematurely.
  • Store cookies in an airtight container at room temperature for up to 3 days to maintain freshness.

Find it online: https://bitezly.com/slime-filled-mandm-cookies-recipe/