Homemade Oatmeal Cream Pies Recipe (40-Min) – Easy & Chewy
The lunchbox classic gets rebuilt from scratch here: soft, chewy oatmeal cookies with a hint of cinnamon, sandwiched around a fluffy marshmallow filling. They taste unmistakably like the packaged version, just softer and fresher.
Ingredients
- 1 cup unsalted butter, softened
- 1 cup packed brown sugar
- 1/2 cup granulated sugar
- 2 large eggs
- 1 tsp vanilla extract
- 1 3/4 cups all-purpose flour
- 1 tsp baking soda
- 1/2 tsp ground cinnamon
- 1/2 tsp salt
- 3 cups old-fashioned rolled oats
- 1/2 cup unsalted butter, softened, for the filling
- 1 cup marshmallow creme
- 1 cup powdered sugar
- 1/2 tsp vanilla extract, for the filling
Instructions
- Preheat the oven to 350°F and line two baking sheets with parchment paper.
- Cream the butter, brown sugar, and granulated sugar together until light and fluffy, about 2 minutes.
- Beat in the eggs one at a time, then mix in the vanilla extract.
- Whisk the flour, baking soda, cinnamon, and salt together in a separate bowl, then mix into the butter mixture.
- Fold in the rolled oats until evenly distributed.
- Scoop 24 mounds of dough (about 2 tablespoons each) onto the prepared baking sheets, spacing them 2 inches apart.
- Bake for 9-11 minutes, until the edges are set but the centers still look slightly soft.
- Cool the cookies completely on the baking sheets before filling.
- Beat the butter, marshmallow creme, powdered sugar, and vanilla extract together until smooth and fluffy.
- Spread or pipe about 2 tablespoons of filling onto the flat side of half the cookies, then top with the remaining cookies to form sandwiches.
- Chill for 15 minutes to let the filling set before serving.
Why This Homemade Oatmeal Cream Pies Works
The combination of brown sugar and old-fashioned oats (rather than quick oats) is what gives these cookies their chew — brown sugar holds moisture better than white sugar, and the thicker oat flakes hold their shape instead of dissolving into the dough. Pulling the cookies from the oven while the centers still look slightly underdone means they finish setting on the hot pan, staying soft enough to bite into once sandwiched.
Tips for the Best Oatmeal Cream Pies
Let the cookies cool completely before filling — even slightly warm cookies will melt the marshmallow filling and make it slide out. Matching cookies by size before sandwiching them gives a more even, professional-looking cream pie. Old-fashioned rolled oats give the best chew here; quick oats make the cookies too soft and cakey.
Common Mistakes to Avoid
Overbaking the cookies is the most common mistake — since they continue cooking on the hot pan after coming out of the oven, pulling them at 9-10 minutes (when the centers still look slightly underdone) keeps them soft instead of crisp. Filling warm cookies causes the marshmallow filling to melt and ooze out the sides once assembled. Skipping the chill step means the sandwiches don’t hold together well when picked up.
What to Serve with Oatmeal Cream Pies
These are a lunchbox and after-school snack on their own, but they also work well crumbled over vanilla ice cream. For a breakfast-adjacent spread, pair them with a bowl of baked oatmeal without eggs for two different takes on oats in one sitting.
Storage
Store assembled cream pies in an airtight container at room temperature for up to 3 days, or refrigerate for up to a week. Unfilled cookies freeze well for up to 3 months — thaw and fill with fresh marshmallow filling when ready to serve.
Frequently Asked Questions
Can I use quick oats instead of old-fashioned oats? Old-fashioned oats hold their texture better and give the classic chewy bite. Quick oats will work in a pinch but make the cookies noticeably softer and less textured.
Why did my oatmeal cream pie filling turn out runny? This usually happens if the filling is beaten too briefly, or the butter was too soft. Beat the filling for a full 2-3 minutes until it visibly thickens and holds its shape.
Can I make the cookies ahead and fill them later? Yes — bake the cookies up to 2 days ahead and store them unfilled at room temperature, then whip up the filling and assemble right before serving.
Can I make homemade oatmeal cream pies smaller or larger? Yes — for mini cream pies, use a tablespoon of dough per cookie and bake 7-8 minutes; for larger ones, use 3 tablespoons and bake 12-13 minutes.
