Chocolate Orange Oat Bars

Need a break from rolling, cutting and decorating cookies? These chocolate orange oat bars are an easy slice-and-share dessert that’s perfect for packing into lunchboxes, bringing to cookie exchanges and holiday gatherings, and gifting to friends and neighbors. With layers of chewy oats, fudgy chocolate and sweet-tart orange marmalade, these cookie bars taste like a chocolate-covered orange—delightfully unexpected next to classic sugar cookies and peanut butter blossoms.

Ingredients for Chocolate Orange Oat Bars

• Butter: Butter gives these bars their rich flavor and soft, tender crust. Soften butter on the counter before baking so it’s easier to cream with the sugar.
• Brown sugar: Brown sugar adds moisture and a subtle caramel flavor that pairs beautifully with the chocolate and orange. Light or dark brown sugar both work, though dark brown sugar gives the bars a slightly deeper molasses flavor.
• Eggs: Room temperature eggs blend more easily into the batter for a smoother dough. Forgot to take them out ahead of time? Place them in a bowl of warm water for about 10 minutes.
• Vanilla: A generous splash of vanilla extract rounds out the chocolate and brightens the orange layers. Use pure vanilla extract for the best flavor.
• Oats: Quick oats are the best choice here for a tender, chewy crust and crumb topping. Old-fashioned oats will give the bars a chewier, more rustic texture, while instant oats are too fine for this recipe.
• Flour: All-purpose flour gives the oat mixture enough structure to hold together while staying soft and chewy. Spoon and level the flour rather than scooping it directly from the bag to avoid packing it in too much.
• Salt: Don’t skip the teaspoon of salt in the oat crust mixture. It balances the sweetness and makes the chocolate taste even richer.
• Baking soda: Baking soda helps keep the oat layer light and tender instead of dense.
• Sweetened condensed milk: When combined with melted chocolate chips, sweetened condensed milk creates a thick, fudgy chocolate filling.
• Chocolate chips: Semisweet chocolate chips make the filling rich without turning it overly sweet. Feel free to swap in dark chocolate chips if you prefer a more intense chocolate flavor.
• Orange marmalade: Orange marmalade adds bright citrus flavor that balances the rich chocolate filling. If you’re not a fan of the peel, look for a smooth marmalade or snip any larger pieces of peel with kitchen shears before spreading the marmalade over the bars.

Directions

Step 1: Cream the butter and sugar

Preheat the oven to 350°F. In a large bowl, beat 1 cup of butter with the brown sugar until they’re light and fluffy, five to seven minutes. Beat in the eggs and 2 teaspoons of vanilla extract.

Editor’s Tip: Forgot to soften the butter? Cut it into small cubes with a pastry cutter or knife to help it warm up faster.

Step 2: Make the oat crust

In a separate bowl, whisk together the oats, all-purpose flour, baking soda and 1 teaspoon of salt. Gradually add the dry ingredients to the creamed mixture and mix them well. Press two-thirds of the oat mixture into the bottom of a greased 15x10x1-inch baking pan.

Step 3: Make the chocolate filling

In a large saucepan, combine the milk, chocolate chips, remaining 2 tablespoons of butter and remaining 1/2 teaspoon of salt. Cook and stir the mixture over low heat until the chocolate is melted and smooth. Remove the pan from the heat and stir in the remaining 2 teaspoons of vanilla. Spread the warm chocolate mixture evenly over the oat crust.

Step 4: Add the topping

Dollop spoonfuls of the orange marmalade over the chocolate layer, then use the back of a spoon or an offset spatula to gently spread it around. Sprinkle the remaining oat mixture over the top.

Step 5: Bake the bars

Bake the bars until they’re golden brown, about 25 to 27 minutes. Let the bars cool completely on a wire rack before slicing them into squares.

Editor’s Tip: It’s tempting to dig in while they’re warm, but letting the bars cool completely helps the chocolate layer set for cleaner slices.

Recipe Variations

• Switch up the fruity layer: Replace the orange marmalade with raspberry, apricot, cherry or strawberry jam. Berries and cherries are especially delicious with chocolate, just like chocolate-covered fruit!
• Change the chocolate: Semisweet chocolate offers a nice balance of sweetness and rich chocolate flavor. Use dark chocolate chips for a deeper, more intense flavor, or milk chocolate chips for a sweeter, creamier filling.
• Add nuts: Sprinkle chopped pecans, walnuts, sliced almonds or toasted hazelnuts over the chocolate layer or mix them into the oat crust for a little crunch.
• Finish with a glaze: Once the bars have cooled, drizzle them with a simple vanilla or chocolate glaze. For even more citrus flavor, try a glaze made with powdered sugar and orange juice.
• Make them extra chocolaty: Stir a handful of mini chocolate chips into the oat mixture or sprinkle a few over the marmalade before adding the crumble topping.

How to Store Chocolate Orange Oat Bars

Keep chocolate orange oat bars in an airtight cookie storage container at room temperature for up to three days. If you make these during the summer months or your kitchen runs warm, store them in the refrigerator for up to one week to help keep the chocolate filling firm.

For the best texture, let refrigerated bars sit at room temperature for about 15 minutes before serving them. This softens the oat crust and lets the chocolate filling become fudgy again.

Can you freeze chocolate orange oat bars?

Yes! To freeze chocolate orange oat bars, let them cool completely, then arrange them in a single layer in an airtight container or freezer bag, separating layers with parchment or waxed paper to prevent sticking. Freeze them for up to three months.

Thaw the bars overnight in the refrigerator or let them sit at room temperature for about 30 minutes before enjoying them. They taste great straight from the fridge, but they’re at their fudgiest once they’ve had a chance to soften a bit at room temperature.

Chocolate Orange Oat Bar Tips

Can you use old-fashioned oats instead of quick-cooking oats?

You can make chocolate orange oat bars with old-fashioned oats, but the texture will be slightly different. Quick-cooking oats are cut into smaller pieces than old-fashioned or rolled oats, which translates to a softer crust. Old-fashioned oats will give the bars a heartier, chewier texture and a more noticeable oat flavor.

Can you use a different fruit spread?

Yes! Orange marmalade gives these bars their signature citrusy flavor, but you can replace it with another fruit spread if you’d like. Try raspberry, apricot, cherry or strawberry preserves for a different twist. Just keep in mind that thicker fruit jams and preserves work best for layering on top of the chocolate filling without spreading too much in the oven.

What else can you add to chocolate orange bars?

These bars are delicious as is, but you can add a few extras for even more flavor and texture. Stir chopped pecans, walnuts or almonds into the oat mixture for a nutty twist, or sprinkle toasted coconut over the chocolate layer before adding the marmalade.

For an extra-special finish, drizzle the cooled bars with melted chocolate or a simple citrus glaze made from powdered sugar and orange juice. A sprinkle of flaky sea salt and a handful of mini chocolate chips would also make fun toppings.