Ingredients for Gooey Peanut Butter Cookie BarsButter: Soften the butter to room temperature so it beats seamlessly with the peanut butter and sugars. Peanut butter: We didn’t hold back on the peanut butter flavor here. Step 4: Bake the cookie barsBake the gooey peanut butter cookie bars until they’re golden brown, 25 to 30 minutes. How to Store Gooey Peanut Butter Cookie BarsOnce the gooey peanut butter cookie bars cool to room temperature, wrap them in their pan with storage wrap or transfer slices to an airtight container. Gooey Peanut Butter Cookie Bars TipsEllie Crowley For Taste Of HomeCan you make gluten-free gooey peanut butter cookie bars?