Homemade Oatmeal Cream Pies

These homemade oatmeal cream pies are soft, chewy oatmeal cookies with a gentle touch of cinnamon, sandwiched around a thick and fluffy vanilla buttercream filling. They taste like the lunchbox treat so many of us grew up with, only fresher and more buttery. The dough comes together in one bowl plus a quick dry mix, bakes in about 10 minutes, and the filling takes just a few minutes with a mixer.

Why You’ll Like These Oatmeal Cream Pies

The cookies stay tender in the middle because they come out of the oven while the centers still look slightly soft. Quick oats give them a fine, even texture that is perfect for sandwiching, so the cookies hold together without being crumbly. The filling is sweet and creamy but firm enough to stay put, so every bite has a balance of chewy cookie and smooth vanilla cream.

• Simple pantry ingredients: oats, flour, butter, brown sugar and powdered sugar.
• Soft and chewy: pulling them at the right moment keeps the centers tender.
• Nostalgic and fun: a homemade version of a classic snack cake that kids and adults love.

Ingredients for Oatmeal Cream Pies

For the Cookies

• 1 1/2 cups quick oats (or rolled oats pulsed briefly)
• 1 cup all-purpose flour
• 1/2 cup butter, softened
• 3/4 cup packed brown sugar
• 1 large egg
• 1 tsp vanilla extract
• 1 tsp baking soda
• 1/2 tsp ground cinnamon
• Pinch of salt

For the Cream Filling

• 1/2 cup butter, softened
• 1 1/2 cups powdered sugar
• 1 tsp vanilla extract
• 1 to 2 tbsp milk, added as needed

You will need two baking sheets, parchment paper, a mixer, a tablespoon or small cookie scoop and a cooling rack. Makes about 10 to 12 sandwich cookies, depending on size.

Ingredient Notes

The oats: Quick oats are cut smaller than rolled oats, which gives the cookies a finer texture that is ideal for sandwich cookies. If you only have rolled oats, pulse them in a food processor a few times until they are broken down but not powdery.

The brown sugar: Packed brown sugar adds moisture and a light caramel flavor, which is what keeps these cookies soft and chewy.

The butter: Use softened butter for both the dough and the filling. It should press in easily with a finger but not look greasy or melted.

The milk: Start with just 1 tablespoon in the filling. Add more only if it is too stiff to spread, since too much milk makes the filling slide out of the cookies.

How to Make Oatmeal Cream Pies

Step by Step

1. Prep the oven. Preheat the oven to 350°F and line two baking sheets with parchment paper.
2. Cream the butter and sugar. In a large bowl, beat the softened butter and brown sugar until light and creamy, about 2 minutes. Mix in the egg and vanilla until smooth.
3. Mix the dry ingredients. In a separate bowl, stir together the oats, flour, baking soda, cinnamon and salt.
4. Combine. Add the dry ingredients to the butter mixture and mix just until no dry streaks remain. Do not overmix.
5. Scoop. Drop rounded tablespoons of dough onto the baking sheets, leaving about 2 inches between them. Gently flatten each mound slightly with your fingers or the bottom of a glass.
6. Bake. Bake for about 10 to 12 minutes, checking at 9 to 10 minutes. The edges should be set while the centers still look slightly soft.
7. Cool. Let the cookies rest on the baking sheet for 5 minutes, then transfer them to a rack to cool completely.
8. Make the filling. Beat the butter until smooth. Gradually beat in the powdered sugar, then add the vanilla and 1 tablespoon of milk. Beat until fluffy, adding a little more milk only if needed. The filling should stay thick enough to hold its shape.
9. Assemble. Once the cookies are completely cool, pair them up by size. Spread or pipe filling onto the flat side of one cookie and top with another, pressing gently. Repeat with the rest.

Tips for the Best Oatmeal Cream Pies

Use Quick Oats

Quick oats give a finer, more uniform cookie that sandwiches neatly and looks like the classic version.

Do Not Overbake

Pull the cookies when the edges are set but the centers still look a little underdone. They finish setting on the hot pan and stay soft for days.

Cool Completely Before Filling

Even slightly warm cookies will melt the buttercream. Give them time on the rack before you assemble.

Chill a Soft Filling

If the filling feels too soft to spread, especially in a warm kitchen, chill it for 10 to 15 minutes, then beat it briefly again.

Match Cookie Sizes

Scooping evenly helps the cookies bake at the same rate, and pairing similar sizes makes neat, even sandwiches.

Variations

• Extra spiced: add a pinch of nutmeg and ginger to the dough for a warmer fall flavor.
• Brown butter filling: brown and cool the butter before whipping it for a nutty, toasty cream.
• Marshmallow cream filling: beat a few spoonfuls of marshmallow creme into the buttercream for a lighter, stickier center.
• Raisin oatmeal: fold a handful of finely chopped raisins into the dough.
• Maple cream: swap the vanilla in the filling for maple extract.
• Mini cream pies: scoop teaspoon-size mounds and bake 7 to 8 minutes for bite-size treats.

Storage

Room temperature: Keep assembled oatmeal cream pies in an airtight container in a single layer or with parchment between layers for up to 2 days in a cool kitchen.

Refrigerator: For longer storage, refrigerate them in an airtight container for up to 5 days. Let them sit out for 10 to 15 minutes before eating so the filling softens.

Freezer: Wrap assembled cookies individually and freeze for up to 2 months. Thaw in the refrigerator or on the counter for about 30 minutes.

Make-ahead: Bake the cookies a day ahead and store them airtight, then make the filling and assemble when you are ready to serve.

Frequently Asked Questions

Can I use old-fashioned rolled oats?

Yes, but pulse them briefly in a food processor first. Whole rolled oats make a chunkier, more rustic cookie that is harder to sandwich neatly.

Why did my cookies turn out hard?

They were most likely overbaked. Take them out as soon as the edges are set, even if the centers look soft, and let them finish on the baking sheet.

How do I keep the filling from squishing out?

Keep the filling thick by adding milk slowly, and make sure the cookies are fully cool. Chill the filling briefly if it starts to feel loose.

Can I make the dough ahead of time?

Yes. Cover and refrigerate the dough for up to 2 days. Let it soften slightly at room temperature before scooping, and add a minute to the bake time if needed.