Chocolate Oatmeal Cookie Bars

Chocolate Oatmeal Cookie Bars

Chocolate oatmeal cookie bars are rich, chewy, and deeply satisfying. They have the hearty texture of an oatmeal cookie paired with a smooth chocolate layer that firms up beautifully and slices cleanly after chilling.

Jump to Recipe

For snacking or dessert, they are delicious and taste indulgent. Try cutting them into small bars because a little truly goes a long way. They are perfect for sharing, gifting, or tucking into the freezer for later.

Why These Bars Work So Well

• A buttery oatmeal base with brown sugar and a hint of cinnamon
• A fudgy chocolate layer that sets beautifully as it cools
• Easy to cut into neat, small portions
• Great for make-ahead baking
• Freezer friendly

Texture and Flavor Notes

The oatmeal layer bakes up chewy and sturdy, not crumbly. The chocolate center is smooth and rich, almost candy-like once chilled. If you include raisins and peanuts, you get a pleasant sweet and salty contrast. If you leave the raisins out, the chocolate flavor takes center stage.

Ingredients You’ll Need

Oatmeal Cookie Layer

• All-purpose flour
• Baking soda
• Salt
• Ground cinnamon
• Unsalted butter, softened
• Brown sugar
• Eggs
• Vanilla extract
• Old-fashioned rolled oats
• Salted peanuts, chopped

Chocolate Layer

• Sweetened condensed milk
• Semisweet chocolate chips
• Unsalted butter
• Salt
• Vanilla extract
• Raisins (optional)
• Chopped peanuts (optional but recommended)

Full measurements are listed in the recipe card below.

Optional Variations

• No raisins: Leave them out entirely. The bars are still excellent.
• Coconut: Add 1/3 cup sweetened shredded coconut to the chocolate layer or to the reserved oatmeal topping.
• Different nuts: Pecans or walnuts work well in place of peanuts.
• Extra chocolate: Sprinkle a small handful of mini chocolate chips over the top before baking.

How to Make Chocolate Oatmeal Cookie Bars

Preheat your oven to 350°F. Grease a 9 x 13-inch baking pan and line it with parchment paper, leaving an overhang on two sides. This makes it easy to lift out for slicing and serving.

Whisk together 2 1/2 cups flour, 1 teaspoon baking soda, 1 teaspoon salt, and 1/2 teaspoon cinnamon.

In a large mixing bowl, beat 1 cup (2 sticks) butter until creamy. Add 2 cups brown sugar and beat for about 2 minutes until lightened. Add 2 large  eggs one at a time, beating well after each addition. Beat in 2 teaspoons vanilla.

Add the dry ingredients and mix just until combined.

 Stir in 3 cups oats and 1 cup chopped peanuts.

Press in the cookie base

Set aside 1 1/2 to 2 cups of the oatmeal mixture for the topping. Press the remaining dough evenly into the prepared pan.

Make the chocolate layer

In a heatproof bowl set over gently simmering water, melt the can of sweetened condensed milk, 2 cups semisweet chocolate chips, 2 tablespoons unsalted butter, and 1/4 teaspoon salt. 

Stir the mixture until smooth and fully melted. Remove from heat and stir in the vanilla. Add raisins and chopped peanuts if using.

Pour the chocolate mixture evenly over the oatmeal base.

Spread evenly.

Add topping and bake

Scatter the reserved oatmeal mixture over the chocolate layer. Do not press it down and do not worry about covering every spot.

Bake for 25 to 30 minutes, until the top is lightly golden and the chocolate layer looks set and slightly pulled from the edges.

Cool and slice

Cool the pan on a rack for about 2 hours. Chill for at least 1 hour before slicing for best results.

Lift the bars out using the parchment overhang. Slice into small rectangles or squares, wiping the knife between cuts for clean edges.

Serving and Storage

These bars are excellent chilled and even better the next day.

• Room temperature: Up to 4 days, tightly covered
• Refrigerator: About 1 week
• Freezer: Up to 2 months

For freezer storage, cut into portions and layer with parchment paper.

Gifting Ideas:

There are many ways to package an gift these sweet treats. Coordinate packaging and ties with the holiday, season or color preference. Consider using…

• cellophane bags
• Bakery style boxes
• Clear containers
• Decorative tins
• Gift bags
• Finished with pretty ribbons or bows

Chocolate Oatmeal Cookie Bars

Chocolate Oatmeal Cookie Bars are rich, chewy bar cookies made with a buttery oatmeal base and a smooth, fudgy chocolate layer. They slice best once chilled and are ideal for make-ahead baking, gifting, or freezing for later.

Print Recipe

Equipment

• Preheat oven to 350°F. Grease a 9 x 13-inch pan and line with parchment if desired.

Ingredients

  

1x2x3x

Oatmeal Layer

• 2 1/2 cups all-purpose flour
• 1 teaspoon baking soda
• 1 teaspoon salt
• 1/2 teaspoon ground cinnamon
• 1 cup 2 sticks unsalted butter, room temperature
• 2 cups packed brown sugar
• 2 large eggs
• 2 teaspoons vanilla extract
• 3 cups old-fashioned rolled oats
• 1 cup salted peanuts coarsely chopped

Chocolate Layer

• 1 14-ounce can sweetened condensed milk
• 2 cups semisweet chocolate chips
• 2 tablespoons unsalted butter
• 1/4 teaspoon salt
• 1 teaspoon vanilla extract
• 1 cup raisins optional
• 3/4 cup chopped peanuts optional

Instructions

 

• Preheat oven to 350°F. Grease a 9 x 13-inch pan and line with parchment if desired. Place pan on a baking sheet.
• Whisk together flour, baking soda, salt, and cinnamon.
• Beat butter until creamy. Add brown sugar and beat 2 minutes. Add eggs one at a time, beating well. Beat in vanilla.
• Add dry ingredients and mix just until combined. Stir in oats and peanuts.
• Reserve 1 1/2 to 2 cups of the mixture. Press remaining dough evenly into the pan.
• Melt condensed milk, chocolate chips, butter, and salt over simmering water, stirring until smooth. Remove from heat and stir in vanilla. Add raisins and peanuts if using.
• Pour chocolate layer over base. Scatter reserved oatmeal mixture on top without pressing.
• Bake 25 to 30 minutes until lightly golden and set.
• Cool 2 hours. Chill at least 1 hour before slicing.

Notes

Chilling makes slicing much easier and cleaner.
If your peanuts are very salty, reduce the salt in the oatmeal layer slightly.
These bars freeze very well.

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