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There’s something about cranberries bursting in a hot orange syrup that pulls me into baking mode every time the weather turns, the same way a orange poppy seed tea cake does.
I first made these cranberry orange oat bars with a bag of fresh cranberries left over from Thanksgiving, and they disappeared faster than the pie did.
The base is a simple oat and brown sugar crumble, pressed into the pan and split in two. Half goes down first, the tart cranberry orange filling goes in the middle, and the rest gets scattered on top before baking.
Bake them until the top is golden and the fruit bubbles at the edges, about 35 minutes at 175C/350F. Let them cool fully before cutting or the filling will slide instead of hold its shape.
Why You’ll Love This Recipe
- Buttery oat crumble needs just one bowl to mix
- Fresh cranberries add tart contrast to the sweet crumble
- Bars slice clean once fully cooled, no mess
- Freezer-friendly, good for make-ahead breakfasts or snacks
Ingredient Notes
- Rolled oats: Use old-fashioned rolled oats, not instant or quick oats, so the crumble holds its texture instead of turning mushy.
- Cranberries: Fresh or frozen both work. If using frozen, add them straight from the freezer, no need to thaw first.
- Orange zest and juice: Use a real orange rather than bottled juice for the brightest flavor, and zest before juicing.
- Unsalted butter: Melted butter binds the crumble. If you only have salted butter, cut the added salt in the recipe by half.
- Cornstarch: Thickens the cranberry filling so it slices cleanly. Arrowroot starch works as a 1:1 swap.
- Brown sugar: Light or dark brown sugar both work, dark brown will give a slightly deeper, molasses-forward flavor.
Homemade Cranberry Orange Oat Bars with Crumble Top
Ingredients
Method
- Heat oven to 175C/350F. Line a 9x9 inch (23x23 cm) baking pan with parchment paper, leaving an overhang on two sides.
- In a large bowl, stir together rolled oats, flour, brown sugar, baking soda and salt.
- Pour in melted butter and orange zest, stir until the mixture looks like wet sand and clumps when pressed.
- Press about two-thirds of the crumble firmly into the bottom of the prepared pan. Set the rest aside.
- Combine cranberries, sugar, orange juice and orange zest in a saucepan over medium heat.
- Simmer for 8 to 10 minutes, stirring occasionally, until most berries have burst and the juice looks glossy.
- Stir the cornstarch with 1 tbsp water, add to the saucepan, and cook 1 more minute until the filling thickens enough to coat the back of a spoon.
- Spread the cranberry filling evenly over the crumble base.
- Scatter the reserved crumble over the top, breaking up any large clumps with your fingers.
- Bake for 35 minutes, until the top is golden and the filling bubbles at the edges.
- Cool in the pan for at least 2 hours before lifting out by the parchment overhang and cutting into 16 bars.
Notes
- Press crumble firmly into pan corners for even bars that don't crumble apart.
- Use a sharp knife wiped clean between cuts for neat squares.
- Fresh cranberries give brighter tartness than frozen, but frozen works fine unthawed.
- Let bars cool fully before cutting, at least 2 hours, for clean slices.
Tips for Success
- Press the crumble base firmly into the pan, just like with raspberry almond tea bars, so the bars hold together once sliced.
- Simmer the cranberries until most pop and the juice thickens slightly, about 8 to 10 minutes.
- Cool the bars completely, at least 2 hours, before cutting or the filling will smear.
- Use frozen cranberries straight from the freezer, no need to thaw before cooking the filling.
- Line the pan with parchment, leaving an overhang, so you can lift the whole slab out cleanly.
Variations
- Swap cranberries for raspberries or chopped dried apricots when fresh cranberries are out of season.
- Stir 1/2 cup chopped walnuts or pecans into the crumble for extra crunch and nutty flavor.
- Use gluten-free oats and a 1:1 gluten-free flour blend to make these bars gluten free.
Storage and Reheating
Store cranberry orange oat bars in an airtight container at room temperature for up to 2 days. They’ll stay firm and hold their shape best when kept cool rather than in a warm kitchen.
For longer storage, refrigerate the bars for up to a week. The crumble stays crisp and the filling stays sliceable straight from the fridge.
To freeze, wrap individual bars in plastic wrap and store in a freezer bag for up to 3 months. Thaw at room temperature for about an hour, or warm one in the microwave for 15 seconds if you want the crumble slightly soft again.
Serving Suggestions
Cranberry orange oat bars go well with a strong cup of coffee or black tea in the morning, since the bitterness balances the tart filling.
For dessert, warm a bar for 10 seconds in the microwave and add a scoop of vanilla ice cream on the side. The contrast between warm crumble and cold ice cream works.
They also travel well plain, wrapped in parchment, much like apple cinnamon tea buns, for lunchboxes or a road trip snack.
FAQ
How do I know when the cranberry filling is done cooking?
The filling is ready when most berries have burst and the juice looks glossy and coats a spoon, after about 8 to 10 minutes of simmering. It thickens more as it cools, so don’t wait for it to look like jam in the pot or it’ll turn gummy once baked.
Can I use dried cranberries instead of fresh in this recipe?
Yes, dried cranberries work, though it’s best to plump them in the orange juice for 10 minutes first so they don’t stay chewy in the filling. Use about 1 1/2 cups dried cranberries and cut back the added sugar slightly since dried fruit is sweeter than fresh.
Can I freeze cranberry orange oat bars for later?
Yes, these bars freeze well for up to 3 months once fully cooled and cut into squares. Wrap each bar in plastic wrap, then store in a freezer bag or airtight container, and thaw at room temperature for about an hour before eating.
What pairs well with cranberry orange oat bars for breakfast?
Cranberry orange oat bars pair well with plain Greek yogurt or a strong cup of coffee, since both balance the tart-sweet filling. They also work as an afternoon snack alongside a cup of chai, or as dessert with a scoop of vanilla ice cream.
Are cranberry orange oat bars gluten free?
Cranberry orange oat bars aren’t gluten free as written, since the crumble uses regular all-purpose flour. Swap in a 1:1 gluten-free flour blend and certified gluten-free oats, and the bars turn out just as sturdy and hold together the same way.
Why are my oat bars falling apart when I cut them?
Bars usually fall apart when they’re cut warm, before the filling and crumble have had time to set. Let the pan cool at room temperature for at least 2 hours, or chill it for 30 minutes, before lifting out and slicing with a sharp knife.
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