Reese’s Pieces Oatmeal Cream Pie Bars Recipe
These Reese’s Pieces Oatmeal Cream Pie Bars combine the heartiness of oatmeal cookie bars with a luscious marshmallow cream frosting and colorful Reese’s Pieces on top, offering a delightful twist on a classic treat. Perfect for dessert lovers seeking a chewy, creamy, and festive snack bar.
- Prep Time: 20 minutes
- Cook Time: 40 minutes
- Total Time: 1 hour
- Yield: 16 bars 1x
- Category: Dessert
- Method: Baking
- Cuisine: American
Ingredients
Scale
Oatmeal Cookie Base
- 1 1/4 cups all-purpose flour (King Arthur recommended)
- 1 teaspoon salt
- 1/2 teaspoon baking soda
- 12 tablespoons unsalted butter (room temperature)
- 3/4 cup brown sugar, packed (dark or light; dark for richer flavor)
- 1/3 cup granulated sugar
- 1 1/2 teaspoons Vietnamese cinnamon (or any cinnamon)
- 1 teaspoon ground ginger
- 2 teaspoons pure vanilla extract
- 2 large eggs (or 2 flax eggs for vegan option)
- 1 3/4 cups quick-cooking oats (or pulsed old-fashioned rolled oats)
Marshmallow Cream Frosting
- 8 tablespoons unsalted butter (softened, use vegan butter for vegan option)
- 1 cup powdered sugar
- 7 oz marshmallow cream (vegan marshmallow cream for vegan option)
- 1 teaspoon pure vanilla extract
- 1/4 teaspoon salt
Toppings
- Reese’s Pieces (or alternatives like chocolate chips, peanut butter chips, chopped nuts, etc.)
Instructions
- Preheat and Prepare Pan: Preheat your oven to 325°F (163°C). Lightly grease an 8-inch square pan and line it with parchment paper for easy removal of bars.
- Mix Dry Ingredients: In a medium bowl, whisk together the all-purpose flour, salt, and baking soda until they are well combined. Set this mixture aside.
- Cream Butter and Sugars: In a large mixing bowl, use a mixer to beat the softened butter, brown sugar, granulated sugar, cinnamon, ginger, and vanilla extract until smooth and creamy.
- Add Eggs: Beat in the eggs one at a time, making sure to scrape down the sides of the bowl between additions to keep the mixture thick and creamy.
- Combine Dry Ingredients and Oats: Gradually stir the flour mixture into the wet ingredients just until combined, then fold in the quick oats evenly.
- Form Cookie Base: Transfer the oatmeal cookie dough to your prepared pan and use an offset spatula to smooth it into an even layer.
- Bake: Bake in the preheated oven for 35 to 40 minutes, or until the top is a deep golden brown and a toothpick inserted in the center comes out clean.
- Cool Base: Allow the baked bars to cool in the pan on a wire rack for 10 minutes. Then lift the bars out using the parchment paper and let them cool completely on the wire rack before frosting.
- Prepare Marshmallow Frosting: Beat the softened butter in a bowl until fluffy. Add the marshmallow cream, powdered sugar, salt, and vanilla extract. Continue mixing at low to medium speed until the frosting is light, gooey, and creamy. For a stiffer texture, add more powdered sugar gradually.
- Frost and Decorate: Spread the marshmallow cream frosting evenly over the cooled oatmeal bars. Sprinkle Reese’s Pieces or your choice of toppings over the frosting for a festive finish.
- Serve: Cut into bars and enjoy your delicious Reese’s Pieces Oatmeal Cream Pie Bars!
Notes
- You can substitute the eggs with flax eggs (1 tablespoon ground flaxseed mixed with 3 tablespoons water per egg) to make the bars vegan.
- Use vegan butter and vegan marshmallow cream to make the entire recipe vegan-friendly.
- If you don’t have Vietnamese cinnamon, regular ground cinnamon works fine.
- Pulse old-fashioned rolled oats a few times in a food processor if quick-cooking oats are unavailable.
- Add toppings like chocolate chips or chopped nuts as alternatives to Reese’s Pieces for variety.
- For a firmer frosting, add more powdered sugar gradually while mixing.
- Store bars in an airtight container at room temperature for up to 3 days, or refrigerate for longer freshness.
Keywords: Reese's Pieces, oatmeal bars, cream pie bars, marshmallow frosting, dessert bars, cookie bars
