Oatmeal raisin Cookies are a classic for a reason — that combination of chewy oats, sweet raisins, and warm cinnamon just works. These bars take everything you love about the cookie and make it easier: press the dough in a pan, bake, frost, and done. That maple-cinnamon butter frosting on top is the thing that takes them over the edge.

Why You’ll Love These

• One pan, no scooping — press the dough in, bake, and cut into squares. Way easier than drop Cookies.
• That frosting — maple syrup, cinnamon, and butter come together into something warm and not too sweet. It makes the bars.
• Perfectly chewy texture — crisp golden edges, soft and dense center, jammy raisins throughout.
• Great for sharing — they travel well, hold their shape, and taste just as good the next day.
• Familiar but a little different — all the comfort of an oatmeal raisin cookie, with a twist that makes people ask for the recipe.

A Word or Two About Ingredients

The oats: I use quick-cook, not old-fashioned. I know some people feel strongly about this and I’m not one of them, but the quick oats just blend into the bar better for my taste. Old-fashioned oats give you more of a chewy, toothsome texture, which is great in oatmeal but in a bar I want something that holds together a bit more.

The butter: room temperature, and I mean actually room temperature, not “I left it out for six minutes and I’m calling that good enough.” Cold butter doesn’t cream properly. You’ll end up with lumps and I speak from experience.

The raisins: regular dark raisins are what I use. I’ve tried golden raisins once — maybe twice — and they’re fine but they’re not the same. Something about the depth of flavor in the regular ones. I’ve also seen people add a handful of Chocolate chips and I would not do that to an oatmeal raisin cookie bar, but you do what you need to do.

Maple extract in the frosting: the recipe calls for it as optional and I am here to tell you it is not optional. Or, okay, it is — the frosting is good without it — but the extract adds this almost smoky warmth that you’ll miss if you skip it. A quarter teaspoon is all you need.

Ingredients

For the bars:

• 1½ cups all-purpose flour
• 1 teaspoon baking soda
• ¾ teaspoon ground cinnamon
• ½ teaspoon fine salt
• ¾ cup unsalted butter, actually at room temperature
• ¾ cup packed light brown sugar
• 2 large eggs, room temperature
• 2 teaspoons vanilla extract
• 2 cups quick-cook oats
• 1 cup raisins (plus a few extra if you want to scatter some on top — I always do)

For the maple-cinnamon frosting:

• ½ cup unsalted butter, room temperature
• 1½ cups powdered sugar
• 1 tablespoon maple syrup
• 1 to 2 tablespoons heavy cream, room temperature
• ½ teaspoon ground cinnamon
• ¼ teaspoon maple extract (don’t skip it)

  

How to Make Them

Start by preheating your oven to 350°F and getting your 9×9 pan ready — baking spray, parchment paper, the usual. Leave the parchment hanging over the sides a bit so you can lift the whole thing out later without fighting with it. I’ve tried to skip the parchment before and I don’t recommend it.

Whisk together the flour, baking soda, cinnamon, and salt in a bowl and set it aside. In your mixing bowl, cream the butter and brown sugar until it’s genuinely light and fluffy — two to three minutes with a hand mixer, and yes, scrape the sides down because that’s how you end up with pockets of un-creamed butter and nobody wants that. Add the eggs one at a time, beating well after each one. Add the vanilla.

Now add your dry ingredients gradually — I do it in two or three additions, not all at once. Mix until you don’t see any streaks of flour, then switch to a rubber spatula to fold in the oats and raisins. The dough is going to be thick and a little sticky. That’s correct. Don’t panic.

Press the dough into your prepared pan. I use my hands for this — lightly damp hands so it doesn’t stick — and it takes maybe ninety seconds to get it reasonably even. Scatter a few extra raisins on top if you want. I always want.

Bake for 18 to 20 minutes. The edges should be just starting to turn golden. The center might look slightly underdone and that is fine — it’ll set up as it cools. Let it sit in the pan for five or ten minutes, then lift it out onto a wire rack and let it cool completely before you frost it. Completely. I have made the mistake of frosting a slightly warm bar and the frosting slides and melts and it’s not a disaster but it’s not pretty either.

For the frosting:

beat the butter until it’s smooth, then gradually add the powdered sugar. I do this slowly so I don’t end up with a cloud of sugar all over myself and the counter, which has happened more times than I’d like to admit. Once that’s together, add the maple syrup, a tablespoon of heavy cream (add a second if you want something softer and more spreadable), the cinnamon, and the maple extract. Beat it until it’s fluffy.

Spread it over the cooled bars. Cut into squares. Somewhere around sixteen squares if you’re being reasonable, maybe twelve if it’s that kind of week.

Variations

Chopped walnuts folded into the dough are a great addition — gives the bars more of a hearty, almost granola-bar feeling. Pecans work well too, and I’d probably toast them first. If you want to skip the frosting entirely and just do a light dusting of powdered sugar, that works. Or nothing at all. The bars are genuinely good plain. But the frosting is the thing, really.

Storage

These keep on the counter for two or three days covered, and in the fridge for up to a week, though I think they lose a little something after day four. The frosting firms up in the fridge so you might want to let them sit out for a few minutes before you eat them. I’ve frozen them unfrosted and that works fine — I just freeze the bars in a zip bag and make fresh frosting when I want to serve them. Theoretically. I usually end up eating them cold from the freezer with a fork while standing at the counter, and that’s fine too.