
There's something magical about the aroma of cinnamon and oats wafting through the kitchen, bringing back memories of childhood baking sessions and cozy afternoons. These Oatmeal Raisin Cookie Bars take everything we love about the classic cookie and transform it into something even more special. Topped with a velvety maple-cinnamon frosting, they're chewy, warm-spiced perfection that somehow manages to be both nostalgic and excitingly new.
Last weekend, I brought these to a family gathering, and my grandmother, who's famously particular about her oatmeal raisin cookies, asked for the recipe. The secret? Taking time to properly cream the butter and sugar, and using fresh, plump raisins.
Essential Ingredients and Selection Tips
- Butter: Use unsalted, room temperature butter for both bars and frosting. The temperature is crucial - it should indent easily when pressed but still hold its shape.
- Raisins: Look for plump, moist raisins. If they feel dry, soak them in warm water for 10 minutes before adding to the dough.
- Quick-cooking Oats: These provide the perfect texture. Old-fashioned oats work too but will give a chewier result.
- Brown Sugar: Light brown sugar adds moisture and caramel notes. Make sure it's fresh and soft for the best results.
- Maple Syrup: Use pure maple syrup for the frosting - the real stuff makes a noticeable difference in flavor.

Detailed Cooking Instructions
- Pan Preparation:
- Start with a properly prepared pan. Line your 9x9 inch pan with parchment paper, leaving overhang on two sides. Greasing the pan before adding parchment helps it stick in place while spreading the dough.
- Creating the Perfect Dough:
- Begin by creaming your room temperature butter and brown sugar until light and fluffy (about 3-4 minutes). Add eggs one at a time, fully incorporating each before adding the next. Combine dry ingredients separately and whisk thoroughly. Fold in oats and raisins gently by hand.
- Baking Process:
- Spread the dough evenly in the prepared pan using an offset spatula. Bake at 350°F for 25-30 minutes until edges are golden but the center is slightly underbaked. Cool completely before frosting.
- Frosting and Finishing:
- Whip room temperature butter until fluffy. Gradually add powdered sugar, then mix in maple syrup and cinnamon. Adjust consistency with cream as needed. Spread frosting over cooled bars and cut into squares with a plastic knife.
The key to this recipe lies in proper ingredient preparation and attention to texture. Through trial and error, I've found these techniques ensure consistently delicious results.
Chef's Essential Tips
- Toast oats briefly for enhanced nutty flavor.
- Use a plastic knife to cut the bars - it prevents the frosting from sticking.
- If raisins are dry, soak them in warm water for 10 minutes and pat dry before use.

After years of baking these bars, I've learned they're more than just a dessert - they're a way to create moments of joy and connection. Whether shared at a family gathering or packed in a lunchbox as a surprise treat, they never fail to bring smiles to faces.
Frequently Asked Questions
- → Can I make these cookie bars without frosting?
- Yes, they're delicious with or without the maple-cinnamon frosting for a less sweet option.
- → How should I store these cookie bars?
- Store in an airtight container at room temperature for up to 5 days.
- → Can I use old-fashioned oats instead of quick-cooking?
- While quick-cooking oats are recommended, old-fashioned oats will work but give a different texture.
- → How do I know when the bars are done baking?
- The edges should be golden and a toothpick inserted in the center should come out clean.
- → Can I make these gluten-free?
- Yes, use a 1:1 gluten-free flour substitute in place of all-purpose flour.