Oatmeal Cookie Little Debbie Copycat Recipe

These Little Debbie-style oatmeal cream pies pair soft, warmly spiced oatmeal cookies with a fluffy vanilla filling. The cookies bake quickly and become tender rather than crisp, while a short rest lets the filling settle into the familiar sandwich-cookie texture.

Ingredients

1 cup (226 g) unsalted butter, softened, divided
1 cup (200 g) packed light brown sugar
½ cup (100 g) granulated sugar
2 large eggs (about 100 g without shells), at room temperature
1 teaspoon (5 ml) vanilla extract, divided
1 tablespoon (15 ml) unsulphured molasses
1½ cups (188 g) all-purpose flour, spooned and leveled
1 teaspoon (5 g) baking soda
½ teaspoon (1.5 g) ground cinnamon
½ teaspoon (3 g) fine salt
3 cups (240 g) quick-cooking oats
2 cups (240 g) powdered sugar, sifted
1½ cups (about 170 g) marshmallow creme
1 tablespoon (15 ml) milk, plus more as needed

Instructions

Set a rack in the center of the oven and heat it to 350°F (175°C). Line two baking sheets with parchment paper. Let the butter soften until it yields when pressed but is not oily or melted. The ingredient list divides the butter: ¾ cup (170 g) goes into the cookies, and ¼ cup (56 g) goes into the filling.
In a large bowl, beat the ¾ cup (170 g) softened butter with the brown sugar and granulated sugar for about 2 minutes, until creamy. Beat in the eggs one at a time, then mix in ½ teaspoon (2.5 ml) vanilla and the molasses. Scrape down the bowl so the mixture combines evenly.
In a separate bowl, whisk the flour, baking soda, cinnamon, and salt. Add these dry ingredients to the butter mixture and mix on low just until no dry streaks remain. Stir in the quick oats. The dough will be soft; avoid adding extra flour, which can make the cookies dry.
Scoop level tablespoons of dough (about 20 g each) onto the prepared sheets, leaving roughly 2 inches (5 cm) between portions. Flatten each mound slightly with damp fingertips or the bottom of a glass. Bake one sheet at a time for 9–12 minutes, until the edges are set and lightly golden while the centers still look soft. Rotate the sheet once if your oven browns unevenly.
Leave the cookies on the baking sheet for 5 minutes, then transfer them to a wire rack and cool completely, about 20 minutes. They firm up as they cool. Do not fill warm cookies: the filling will soften and slide out.
For the filling, beat the remaining ¼ cup (56 g) butter until smooth. Add the sifted powdered sugar in two additions, mixing on low to prevent a cloud of sugar. Beat in the marshmallow creme, remaining ½ teaspoon (2.5 ml) vanilla, and 1 tablespoon (15 ml) milk. Beat for 1–2 minutes until fluffy. If it is too stiff to spread, add milk 1 teaspoon (5 ml) at a time; if too loose, beat in a little more powdered sugar.
Match cookies in pairs by size. Spread or pipe about 1 tablespoon (15 g) filling on the flat side of one cookie, then gently press on its partner. Set the sandwiches aside for 10 minutes so the filling settles before serving. This recipe makes about 12 sandwich cookies.

Tips

For tender cookies, measure flour by spooning it into the cup and leveling the top, or use the gram weight. Scooping directly from the bag can pack in too much flour.
Quick-cooking oats give the closest soft, cohesive texture. If using old-fashioned rolled oats, pulse them briefly in a food processor; otherwise the cookies will be chewier and more textured.
Use room-temperature eggs and softened, not melted, butter for dough that mixes evenly. If the dough feels unusually loose, chill it for 15 minutes before scooping rather than adding flour.
Marshmallow creme is sold in many grocery stores near baking supplies. If unavailable, use marshmallow fluff; it is a close substitute, though the filling may be slightly softer. Marshmallows melted with butter are not a direct swap because they set differently.

Serving Suggestions

Serve the sandwiches at room temperature for a soft bite and a creamy filling. They go well with a glass of cold milk, coffee, or tea. For a dessert plate, add fresh berries or sliced apples to balance the sweet filling. If serving after chilling, let the cookies stand at room temperature for about 15 minutes so the centers soften.

Variations

For a deeper spice profile, add ¼ teaspoon (0.5 g) ground nutmeg or ginger to the dry ingredients. A small handful of raisins (about ⅓ cup or 50 g) can be mixed into the dough, though that makes these less like the classic packaged-style cookie. For a chocolate note, drizzle the assembled cookies with 2 ounces (57 g) melted semisweet chocolate and let it set before storing. You can also make smaller sandwiches by scooping 2 teaspoons (about 12 g) dough per cookie; begin checking them around 7 minutes and expect a few more sandwiches.

Storage and Reheating

Store assembled cookies in an airtight container. Because the filling contains butter and marshmallow creme, refrigerate them if keeping longer than 2 hours at room temperature; they keep for about 5 days refrigerated. For the best texture, bring them out for 15 minutes before eating. To freeze, arrange the sandwiches in a single layer until firm, then stack with parchment between layers in a freezer-safe container for up to 2 months. Thaw in the refrigerator overnight or at room temperature for about 30–45 minutes. These cookies are not usually reheated; warming can melt the filling.

Frequently Asked Questions

Can I make the dough ahead?
Yes. Cover the dough and refrigerate it for up to 24 hours. Let it sit at room temperature for 10–15 minutes if it is too firm to scoop, then bake as directed. Chilled dough may need an extra minute or two in the oven.

Why did my oatmeal cookies turn out hard?
They may have baked too long, or too much flour may have been measured into the dough. Take them out when the edges are set but the centers still look a little soft, and measure flour by weight or with the spoon-and-level method.

Can I use old-fashioned oats?
Yes, but pulse them a few times first for a texture closer to quick oats. Whole rolled oats make a more pronounced chewy cookie and can make small cookies harder to sandwich neatly.

How do I keep the filling from squeezing out?
Make sure the cookies are completely cool and the filling is thick enough to hold a soft peak. Use a modest tablespoon of filling, press the top cookie gently rather than squeezing, and chill the assembled cookies briefly if the room is warm.

Can I make these without marshmallow creme?
Marshmallow creme provides the characteristic light, stretchy filling. Marshmallow fluff is the easiest substitute. A simple buttercream will work in a pinch, but it will taste sweeter and have a denser texture.

Can I make the cookies smaller or larger?
Yes. Keep the portions consistent so paired cookies match, and adjust baking time: smaller cookies bake faster, while larger ones take longer. Use the visual cues—set edges and soft centers—rather than waiting for the centers to look fully firm.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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