Pipe Dream #245: To Rush – PB Oat Cookie Bars with Marshmallow PB Frosting

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I know these pics aren’t stellar. But let me tell you. Since I made these bars back in…October…I have had numerous and unceasing requests for the recipe.

Dudes are all like, “When is this going up on the blog?”

And I’m all like, “Don’t rush me!”

But I had to leak the recipe because they are just that good.

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First off, the peanut butter oat cookie bar. So soft, but not like soft-batch style cookies. I actually can’t wait to try these as a regular cookie. I hesitate to say cakelike. They were kind of like a blondie, but a little lighter, I thought. And they sliced like a dream in all their underbaked glory.

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The cookie layer was followed by not one, but two layers of frosting. The first was a peanut butter frosting swirled with marshmallow creme. And the second is just straight up marshmallow creme because I had some leftover and can’t be trusted with an open container of marshmallow creme in the house. Girl actually cannot get enough.

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Just please make these immeds. I will too. We can do this together. Like a team-building activity.

L

PB Oat Cookie Bars with Marshmallow PB Frosting

Cookie recipe adapted from Serious Eats

1 1/4 cup all-purpose flour
3/4 teaspoon baking soda
1/2 teaspoon baking powder
1 teaspoon kosher salt
8 tablespoons (1 stick) unsalted butter, softened
1 cup (8 ounces / 227 grams) no-stir peanut butter
1 cup (7.4 ounces / 208 grams) brown sugar, packed
1/4 cup (2.5 ounces / 70 grams) white sugar
2 large eggs
1/2 teaspoon vanilla extract
3/4 cup (3.3 ounces / 96 grams) rolled oats

Heat oven to 350°F. In a large bowl, whisk together flour, baking soda, baking powder, and salt until well combined.

In the bowl of a stand mixer, mix butter on high speed until light and creamy, about 30 seconds, then add in peanut butter and mix on high until well combined, scraping down the sides of the bowl with a spatula as needed. Reduce speed to low and add the sugars, then mix on medium speed until everything is well combined, lighter in color, and fluffy, about 2 minutes. Add eggs and vanilla and mix until well-incorporated.

Reduce mixer speed to low and add flour mixture gradually until fully combined. Increase mixer speed to medium, add oats, and mix until fully combined.

Line a 9×9-inch square pan with parchment paper. Press the dough into the pan evenly. Bake for 9-13 minutes, until the bars look set. Do not overbake. Let cool.

For the frosting layers:

Spread cooled bars with peanut butter frosting like this  (harder) or this (easier), then about 7 ounces (1 jar) of marshmallow fluff. I cut a bit of marshmallow cream into my peanut butter frosting because I am obsessed with marshmallow. You can adjust both of these layers to taste.

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2 Responses to “Pipe Dream #245: To Rush – PB Oat Cookie Bars with Marshmallow PB Frosting”


  1. 1 Adriana G. Ruh October 1, 2014 at 9:48 am

    I love looking through an article that will make men and women think.
    Also, many thanks for permitting me to comment!


  1. 1 2 Legit 2 Quit: An Update on Those Peanut Butter Cookies | piping dreams Trackback on June 5, 2014 at 9:01 am

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