Easy Oat Slice
There are some foods that just feel nostalgic, and oat slice is one of them. This easy oat slice really lives up to its name—it’s quick to make, uses pantry basics, and is the perfect bake for lunchboxes, snacks, or a rainy afternoon in the kitchen with your kids.
Why This Recipe
- A nostalgic family favourite that’s easy to make.
- Flexible: Can be made egg-free, dairy-free and dried fruit swap friendly.
- Made from pantry staples you probably already have at home.
- Perfect for baking with toddlers and kids—no fancy equipment required.
- Delicious, filling, and lunchbox-ready.
Ingredients You Will Need
Ingredient Notes, Substitutes, & Allergy Swaps
- Egg-free option: Use 1 tablespoon chia seeds soaked in 2 tablespoons of water (a “chia egg”) instead of a regular egg.
- Flour: Works with standard plain flour or a gluten-free blend. Avoid coconut flour—it makes the slice too crumbly.
- Butter: Gives the slice its lovely flavor and texture. The recipe will also work with a full fat dairy-free margarine or coconut oil.
- Sugar: Brown sugar gives a nice depth, but any granulated sugar such as coconut sugar or white sugar also work.
- Raisins: Can be swapped for chopped dates, apricots, sultanas, or whatever dried fruit your family enjoys.
Illustrated Step By Step Guide
Below are illustrated step-by-step instructions to make my Easy Oat Slice recipe, if you prefer just the written instructions then head straight to the printable recipe card below.
Step one: Pop your brown sugar, melted butter, egg (or soaked chia seeds if you’re making the egg-free version), and vanilla into a big mixing bowl. I like to use a whisk here to make sure everything is nicely combined and smooth. This is your “wet base” and it already smells delicious!
Step two: Next, sprinkle in the flour. This is when I usually swap from a whisk to a wooden spoon—it makes the mixing easier once things start to thicken up. Stir until everything looks well blended, but don’t worry if it’s not perfectly smooth—it’s not meant to be.
Step three: Time for the heart of the recipe—rolled oats and raisins! Mix them through so every spoonful is dotted with chewy fruit and hearty oats. You can swap raisins for chopped dates, apricots, or sultanas if that’s what you have in the pantry.
Step four: Spoon the mixture into a lined slice tin (mine is 20 x 20 cm, but a cake tin also works). Use a spatula to press it down firmly into the corners—this helps the slice hold together once baked. This is also a lovely step for little helpers; my toddlers love standing by and watching (or sneaking a raisin or two!).
Step five: Slide the tin into a preheated oven (180°C / 350°F) and bake for around 20–25 minutes. You’ll know it’s ready when the edges turn golden and start to pull away from the tin. Once baked, let it cool in the tin before lifting it out to slice into squares.
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Top Tips
Here is how you can make this Easy Oat Slice perfectly every time!
- Chewy or soft? For a softer texture, increase the flour to oat 1 cup flour to 1 cup oats.
- Line the tin with baking paper so the slice lifts out easily for cutting.
- Don’t over bake—remove when the edges are golden and starting to pull away from the tin. The centre will firm as it cools.
- Store your oat slice in an airtight container for up to 5 days.
- Perfect for lunchboxes, also freezes really well, so you can make a double batch for a freezer stash.
Easy Oat Slice
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Ingredients
- 1 tablespoon chia seeds or 1 Egg
- 2 tablespoon water
- 125 grams butter two thirds cup melted
- ½ cup brown sugar
- 1 teaspoon vanilla
- ½ cup plain flour
- 1 ½ cup rolled oats
- ¾ cup raisins
Instructions
- If you are making the egg-free version of this recipe, then start by soaking the chia seeds in the water in a small bowl, leave them aside for 10 minutes or so. If you are going to make this recipe with an egg then you can skip this step
- Mix the brown sugar and melted butter together, I use a whisk for this step
- Whisk in either the soaked chia seeds or an egg and the vanilla
- Add the flour, mix well (I swap to a wooden spoon at this stage)
- Add the rolled oats and mix well
- Add the raisins and mix so they evenly through the mix
- Pour the mix into lined slice tin (I use a 20 x 20 cm tin, a cake tin will also work if you don't have a slice tin
- Bake at 180 degrees Celsius (350 F) for 20-25 minutes or until the edges are golden and start to come away from the edge of the tin
- Allow to coo,l then slice into squares
Notes
- Egg-free option: Use 1 tablespoon chia seeds soaked in 2 tablespoons of water (a “chia egg”) instead of a regular egg.
- Flour: Works with standard plain flour or a gluten-free blend. Avoid coconut flour—it makes the slice too crumbly.
- Butter: Gives the slice its lovely flavor and texture. The recipe will also work with a full fat dairy-free margarine or coconut oil.
- Sugar: Brown sugar gives a nice depth, but any granulated sugar such as coconut sugar or white sugar also work.
- Raisins: Can be swapped for chopped dates, apricots, sultanas, or whatever dried fruit your family enjoys.
- Chewy or soft? For a softer texture, increase the flour to oat 1 cup flour to 1 cup oats.
- Line the tin with baking paper so the slice lifts out easily for cutting.
- Don’t over bake—remove when the edges are golden and starting to pull away from the tin. The centre will firm as it cools.
- Perfect for lunchboxes, also freezes really well, so you can make a double batch for a freezer stash.
Nutrition
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Delish!
I also added some chopped cranberries and almonds. Replaced half the sugar with some pure honey ?
Will give this recipe a go... how does it go in the freezer please? We love your Weetbix Slice, me especially because I can keep a freezer stash for lunchboxes.
Hi Lee it will freeze for up to 4 months.
This recipe is VERY forgiving. We didn’t have brown sugar, so I mashed up a banana and added a slug of maple syrup. Miss 5 is off dried fruit atm so I added some sugar free choc chips. Double thumbs up from said Miss 5 and great for lunchboxes!
I use 100g of coconut oil instead and it works really well. Such a great recipe! A go to for me for easy lunch boxes.
Delicious! And so easy. I added apricots and cranberries instead of raisins and it was so yummy 🙂
Do these freeze well?
Hi Yes it does freeze well, for up to 4 months.
This recipe easy to make and tastes yummy.I would love to know if it can be frozen ???
Hi Cathy, Yes this recipe can be frozen.
Pretty good! I found it a bit crumbly, so my second batch I added a second egg. I also made a batch with dried apple instead of raisins and substituted 2 tsp cinnamon for the vanilla, came out perfectly!
This slice is so easy to make, yet so delicious. Will definitely be making this on repeat for school lunchbox. ?
its so incredible and it tastes great ?????