Chocolate Oat Sandwich Cookies with Colorful Frosting

Chewy, chocolatey, and charmingly colorful, these Chocolate Oat Sandwich Cookies are a playful yet indulgent treat. Rich dark chocolate and rolled oats create a dense, textured cookie that’s perfectly complemented by a layer of creamy pastel frosting. Whether you’re baking for a celebration, gifting, or just craving something fun and delicious, these sandwich cookies are sure to delight.

Why You’ll Love This Recipe

This recipe combines the best of both worlds: the wholesome chew of oat cookies and the decadence of dark chocolate. Sandwiched with smooth, sweet frosting tinted in soft, pastel hues, these cookies are as pretty as they are satisfying. They’re simple to make, customizable in color and flavor, and perfect for holidays, birthdays, or as a whimsical addition to any dessert platter.

Ingredients

(Tip: You can find the complete list of ingredients and their measurements in the recipe card below.)

For the Cookies:

• 1/2 cup (115g) unsalted butter, softened
• 1/2 cup (100g) brown sugar
• 1/4 cup (50g) granulated sugar
• 1 large egg
• 1 tsp vanilla extract
• 3/4 cup (75g) rolled oats
• 3/4 cup (95g) all-purpose flour
• 1/4 cup (25g) unsweetened cocoa powder
• 1/2 tsp baking soda
• 1/4 tsp salt
• 3 oz (85g) dark chocolate, chopped or chips

For the Filling:

• 1/2 cup (115g) unsalted butter, softened
• 1 1/2 cups (180g) powdered sugar
• 1 tsp vanilla extract
• 1–2 tbsp milk or cream
• Food coloring (optional: pastel pink, blue, green, yellow, etc.)

Directions

1. Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper.
2. In a large bowl, cream the softened butter, brown sugar, and granulated sugar together until light and fluffy.
3. Beat in the egg and vanilla extract until well incorporated.
4. In a separate bowl, mix together the oats, flour, cocoa powder, baking soda, and salt.
5. Gradually add the dry mixture to the wet mixture, stirring just until combined.
6. Fold in the chopped dark chocolate or chocolate chips.
7. Scoop tablespoons of dough onto the baking sheet, spacing them evenly. Flatten each slightly with your fingers or the back of a spoon.
8. Bake for 10–12 minutes, until the cookies are set but still soft in the center. Let them cool completely on a wire rack.
9. For the filling, beat the butter until smooth and creamy. Gradually add the powdered sugar, vanilla extract, and enough milk or cream to reach a spreadable consistency.
10. Divide the frosting into separate bowls and tint each with your choice of food coloring.
11. Spread or pipe the frosting onto the flat side of one cookie, then top with another to form a sandwich. Repeat for all cookies.

Servings and timing

• Prep Time: 20 minutes
• Cooking Time: 12 minutes
• Total Time: 32 minutes
• Servings: 10 sandwich cookies
• Calories per Serving: 240 kcal

Variations

• Flavorful Frosting: Add a drop of almond, orange, or peppermint extract to the frosting for a flavor boost.
• Sprinkle Edge: Roll the frosted edges in sprinkles for extra color and texture.
• Peanut Butter Twist: Mix a tablespoon of peanut butter into the filling for a nutty contrast.
• Mint Chocolate: Use mint extract and green food coloring in the frosting for a cool variation.
• Gluten-Free: Substitute with a gluten-free flour blend and ensure oats are certified gluten-free.

Storage/Reheating

• Storage: Store assembled cookies in an airtight container at room temperature for up to 3 days.
• Refrigeration: Refrigerate for longer freshness (up to 5 days), but allow to sit at room temperature before serving for softer texture.
• Freezing: Freeze unfrosted cookies and filling separately. Thaw and assemble before serving.
• Make-Ahead: Bake the cookies in advance and store at room temperature or freeze, then prepare the filling fresh.

FAQs

Can I make the cookies in advance?

Yes, you can bake the cookies up to 3 days ahead and store them in an airtight container until you’re ready to frost and assemble.

Can I use quick oats instead of rolled oats?

Rolled oats are preferred for texture, but quick oats can be used in a pinch. The cookies may be slightly softer.

How do I make the frosting pastel?

Add just a drop or two of food coloring and mix well. Use gel-based colors for more vibrant results without thinning the frosting.

Can I double the recipe?

Absolutely. This recipe doubles well for parties or gifting.

Are these cookies suitable for kids?

Yes, they are fun, sweet, and customizable—great for birthdays or special treats.

Can I use store-bought frosting?

You can, but homemade frosting gives better texture and allows for easy coloring and flavoring adjustments.

Do the cookies need to be completely cooled before frosting?

Yes, make sure cookies are completely cool to prevent the frosting from melting.

Can I make these without cocoa powder?

For a non-chocolate version, omit the cocoa and increase the flour slightly. Adjust sugar to taste if needed.

How can I ensure the cookies stay chewy?

Do not overbake them. Remove from the oven when they are just set and allow them to finish cooking on the tray.

What kind of chocolate works best?

Dark chocolate (around 60–70%) is ideal for richness, but you can also use milk or semi-sweet chips for a milder flavor.

Conclusion

Chocolate Oat Sandwich Cookies with Colorful Frosting are a delightful way to add whimsy and indulgence to your dessert table. With their rich chocolatey base and soft, creamy center in pastel hues, these cookies strike a perfect balance between fun and flavor. Whether for a festive gathering or a cozy treat, they’re sure to bring smiles with every bite.

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