Name: Vegan Oatmeal Cream Pie Sandwiches Recipe
Prep time: 20 min
Cook time: 15 min
Total time: 45 min
Cuisine: American
Ingredients: 1 cup vegan butter, softened; 1 cup light brown sugar, packed; 1/4 cup granulated sugar; 1 flax egg (1 tbsp ground flaxseed + 3 tbsp water); 1 tbsp molasses; 2 tsp vanilla paste; 3 cups quick oats; 1 and 1/2 cups all-purpose flour (or Bob’s Red Mill gluten-free baking flour); 1 tsp baking soda; 1 tsp ground cinnamon; 1/2 tsp baking powder; 1/2 tsp salt; 1/2 cup vegan butter, softened; 1 tsp vanilla paste; Pinch of salt; 2-6 tbsp non-dairy milk; 2-3 cups powdered sugar, sifted

Jump to Recipe· 4.1 from 10 reviews

If you’ve ever dreamed of a nostalgic treat that’s both comforting and indulgently creamy, then this Vegan Oatmeal Cream Pie Sandwiches Recipe is about to become your new favorite. Imagine soft, chewy oatmeal cookies hugging a dreamy, velvety vanilla buttercream filling — all completely plant-based and utterly delicious. These sandwiches combine warm spices, rustic oats, and smooth frosting to create a treat everyone, vegan or not, will adore. Whether for midday snacks, lunchbox surprises, or cozy dessert moments, this recipe brings joy in every bite.

Ingredients You’ll Need

The image shows a clear glass bowl on a white marbled surface in four frames. In the first frame, a light tan dough with a rough texture fills the bowl, topped with a thick dark brown liquid pooling in the center. In the second frame, the dough is evenly mixed, smooth, and light tan, filling the bowl with soft swirls. In the third frame, white flour is added on top of the light tan dough along with small bits of brown and grainy texture scattered around. In the fourth frame, the mixture turns into a denser, crumbly brown dough that fills the bowl with a rough, grainy texture. photo taken with an iphone --ar 4:5 --v 7

Gathering simple, heartfelt ingredients is the first step to success with this recipe. Each element plays a vital role in achieving that perfect balance of texture, flavor, and creaminess that makes these sandwiches so irresistible.

Vegan butter (softened): Provides richness and creaminess for both cookies and frosting, creating that soft, melt-in-your-mouth feel.
Light brown sugar (packed): Adds warmth and moisture, enhancing the cookie’s chewy texture and giving subtle caramel notes.
Granulated sugar: Balances sweetness and helps achieve a tender cookie crumb.
Flax egg (1 tbsp ground flaxseed + 3 tbsp water): A perfect vegan binder that mimics the texture eggs bring to baking.
Molasses: Infuses the cookies with deep, rich flavor and a beautiful hint of earthiness.
Vanilla paste: Boosts the aroma and imparts a natural, fragrant sweetness to both cookies and frosting.
Quick oats: Essential for that heartwarming oatmeal texture and chewiness.
All-purpose or gluten-free baking flour: Forms the base structure for the cookies, balancing tenderness and durability.
Baking soda and baking powder: Help the cookies rise gently while keeping their soft nature.
Ground cinnamon: Adds a cozy spice that perfectly complements the sweetness and oats.
Salt: Enhances all the flavors, preventing the sweetness from becoming one-dimensional.
Non-dairy milk: Used to adjust the frosting consistency, making it smooth and pipeable.
Powdered sugar (sifted): Key for a luscious, creamy frosting texture that holds its shape well.

How to Make Vegan Oatmeal Cream Pie Sandwiches Recipe

Step 1: Prepare the Oatmeal Cookies

Start by preheating your oven to 350 degrees F and line a baking sheet with parchment paper to prevent sticking. Next, mix your flax egg by combining ground flaxseed with water and letting it thicken for about 5 minutes—this is what will give your cookies their perfect structure. Cream together the vegan butter with both the brown and granulated sugars until your mixture is light and fluffy. Then, add the flax egg, molasses, and vanilla paste, blending everything thoroughly. This creates a base full of moisture and flavor that will keep your cookies tender.

Step 2: Combine the Dry Ingredients

In a separate bowl, whisk together quick oats, all-purpose flour, baking soda, cinnamon, baking powder, and salt. Carefully fold these dry ingredients into your wet mixture until just combined, making sure not to overmix. This step is important for maintaining the chewy, tender texture that defines oatmeal cookies.

Step 3: Shape and Bake the Cookies

Scoop the cookie dough into round balls and space them evenly on your lined baking sheet. Gently flatten each ball to encourage a nice shape and even baking. Bake for 13 to 15 minutes, but take them out while the centers still look just a bit soft. They will continue to set as they cool, ensuring that perfect chewy center everyone loves in oatmeal cookies.

Step 4: Prepare the Vanilla Buttercream Frosting

While your cookies cool, whip up that dreamy buttercream. Beat vegan butter, vanilla paste, and a pinch of salt until the mixture is fluffy and light. Gradually add the sifted powdered sugar, blending until completely smooth. Then, slowly add non-dairy milk, adjusting the amount until you reach a creamy, spreadable or pipeable consistency. This frosting will be the luscious heart of your sandwich cookies.

Step 5: Assemble Your Vegan Oatmeal Cream Pie Sandwiches Recipe

Once cookies have completely cooled, it’s time for the fun part! Transfer your vanilla buttercream to a piping bag or simply use a knife to spread a generous amount onto the flat side of half the cookies. Top with a second cookie, gently pressing together to form the classic sandwich shape. Admire your creation—each bite will have you coming back for more.

How to Serve Vegan Oatmeal Cream Pie Sandwiches Recipe

The image shows a stack of oatmeal sandwich cookies with thick, creamy white filling between each pair. There are three sandwiches stacked vertically, each with two textured, golden-brown oatmeal cookies that have visible oats on the surface. One sandwich cookie is leaning against the stack at an angle to the left, showing the smooth filling clearly. Another sandwich cookie is lying flat and partially visible in the front left corner. The cookies sit on a silver cooling rack lined with white parchment paper, placed on a white marbled surface. In the background, there are blurred white bottles and small white bowls, with a couple of cinnamon sticks on the bottom right corner. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

Sprinkling some cinnamon powder or toasted oats on top of the frosting before sandwiching adds a delightful rustic touch. For a festive vibe, try decorating with a sprinkle of crushed nuts or a drizzle of vegan-friendly caramel sauce to amp up the flavor and presentation.

Side Dishes

Pair these sweet treats with a warm cup of chai tea, almond milk latte, or your favorite dairy-free hot chocolate. For a balanced snack platter, serve alongside fresh fruit or lightly salted nuts to contrast their rich, creamy goodness.

Creative Ways to Present

Turn these sandwich cookies into a charming dessert platter by arranging them in a stacked pyramid or laying them on a bed of edible flowers for a touch of elegance. You can even customize the frosting with natural food coloring or add mix-ins like shredded coconut or vegan sprinkles for festive occasions.

Make Ahead and Storage

Storing Leftovers

Keep any leftover Vegan Oatmeal Cream Pie Sandwiches Recipe treats fresh by storing them in an airtight container at room temperature for up to 3 days. If your kitchen is warm, refrigeration can help maintain firmness but may slightly harden the buttercream.

Freezing

These sandwiches freeze beautifully! Place them in a single layer on a parchment-lined tray and freeze until firm. Then transfer to a freezer-safe container or bag for up to 2 months. When you want a sweet pick-me-up, just thaw them in the fridge overnight.

Reheating

Since these are best enjoyed cool or at room temperature, reheating is not usually recommended. However, if you prefer a warm treat, gently microwave a sandwich for about 10 seconds to soften the buttercream slightly without melting it completely.

FAQs

Can I use gluten-free flour for this Vegan Oatmeal Cream Pie Sandwiches Recipe?

Absolutely! Substitute with your favorite gluten-free baking flour blend to keep these cookies allergy-friendly while maintaining their delicious texture and flavor.

What can I use instead of flax eggs?

If you’re out of flaxseeds, chia seeds mixed with water work just as well. Alternatively, store-bought vegan egg replacers can also be used to bind the dough.

How do I make the frosting less sweet?

To cut down on sweetness, try reducing the powdered sugar slightly and adding a pinch more salt or a splash of lemon juice to balance the flavor without sacrificing creaminess.

Can I make smaller or larger cookies?

Definitely! Just adjust your baking time accordingly. Smaller cookies will need less time in the oven (around 10-12 minutes), while larger ones may need an extra few minutes. Keep an eye on them to avoid overbaking.

Is it possible to use coconut oil instead of vegan butter?

You can substitute coconut oil, but it will change the texture slightly, making the cookies a bit crisper. Also, the frosting may have a different consistency and flavor, so use refined coconut oil if you want a neutral taste.

Final Thoughts

There is something truly special about making and savoring these Vegan Oatmeal Cream Pie Sandwiches Recipe. They capture the perfect balance of wholesome oats, cozy spices, and dreamy vanilla frosting, all wrapped up in a vegan-friendly package. Whether you’re baking for loved ones or treating yourself, this recipe brings warmth and sweetness to any day. So don’t hesitate—grab your ingredients and dive into creating these lovable cookie sandwiches that are sure to become a cherished classic in your kitchen.