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    Home > Recipes > Vegan Baking

    Ugly But Delicious Oat Slice

    Updated: Nov 14, 2025 | Published: Nov 7, 2025 | by Amanda | Leave a Comment

    Skip to Recipe

    How can you not make this oat slice with a title like that, right? But looks aside, if you need a wholesome, easy-to-make slice that will satisfy your sweet tooth but is a little more nutritious than a store-bought treat, this might be it.

    It ain't pretty, but this slice is sweet, buttery and super quick to make. And if oats are your thing, try my no-bake chocolate peanut butter oatmeal bar.

    Oat Slice cut into bars.
    Jump to:
    • Why This Recipe Works
    • Ingredients & Substitutes
    • Step-by-Step Guide
    • FAQs
    • More Sweet Things
    • Make This Recipe
    • Leave a Comment

    Why This Recipe Works

    • This is a fuss-free recipe that is perfect for lunchboxes.
    • It's made with whole flour and regular flour for a touch more fibre.
    • Oat slice is super adaptable - add seeds, nuts, apricots or even chocolate chips.
    • Making your own slice only takes around 10-minutes plus baking time and is more budget-friendly than store-bought bars.

    Ingredients & Substitutes

    Oat slice ingredients in a grid with labels.

    Vegan buttery spread. Using butter gives this oat slice shortbread vibes.

    Raw sugar. I always use raw sugar in my cooking, but you could also use brown.

    Two flours. Yes, I know - it's a pain in the butt. But adding whole flour to the recipe adds fibre and a little nuttiness. You can just use all-purpose flour, if you like.

    Apple sauce. Besides adding sweetness, the pectin in apple sauce helps to hold the slice together. I use it in my vegan vanilla cupcakes and it binds like a dream.

    Desiccated coconut. Use the smaller desiccated coconut flakes rather than shredded coconut. Small flakes are best here to help with binding.

    Dried fruit. I pretty much always use sultanas in this slice, but you could swap them out for currants, chopped dried apricots or any dried fruit you like.

    Step-by-Step Guide

    You'll find full instructions and measurements in the recipe card at the bottom of the post.

    Steps 1-3.

    Gently melt the butter, sugar and vanilla in a saucepan over low-medium heat. The sugar doesn't need to be completely dissolved, but we want the butter nice and melty. Remove from the heat and add the apple sauce and give it a good whisk. Set aside.

    Side-by-side images of melted butter in a pan.

    Step 4.

    Combine the dry ingredients, other than the sultanas, in a mixing bowl.

    Side-by-side images of melted butter and a bowl of oats.

    Steps 5-7.

    Add the melted butter mixture to the dry ingredients and stir until almost combined and then throw in the sultanas and fold them through.

    Side-by-side images of dough art different stages of mixing.

    Steps 8-9.

    Transfer the batter to a lined square baking pan and press it down well. The mixture is thick and sticky so I wet my offset spatula to smooth it out easier. There is a fair amount of finger licking that goes on here, no judgment.

    Side-by-side images of baking dough.

    Step 10.

    Transfer the oat slice to the oven and bake for 20-25 minutes at 170℃ (340℉) or until golden. Remove from the oven and allow to cool for 15 minutes before cutting the slice into bars while still slightly warm.

    Once completely cooled, store in an airtight container for up to 5 days.

    Side-by-side images of baking dough before and after baking.

    FAQs

    Can I use only all-purpose flour instead of two flours?

    Yes.

    More Sweet Things

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      Cafe-style Chocolate Chip Banana Bread
    • Peanut butter oatmeal squares with chocolate on a wooden board
      Chocolate Peanut Butter Oatmeal Bars
    • Freshly baked chocolate chip cookies on baking paper.
      Vegan Peanut Butter Chocolate Chip Cookies
    • A jar of oats with a spoon.
      Peanut Butter Overnight Oats

    Sign up to my newsletter and follow along on Facebook, Pinterest and Insta for all the latest news. If you like this recipe, please check out my cookbook "Great Vegan Meals for the Carnivorous Family" It's full of simple, carnivore-approved family recipes.

    Make This Recipe

    Oat Slice cut into bars.

    Ugly But Delicious Oat Slice

    It ain't pretty but this oat slice is simple, buttery and budget-friendly. Perfect for lunchboxes or a nice cuppa. Put your feet up, this one's easy.
    No ratings yet
    Print Pin Rate
    Course: Afternoon Tea | Snack
    Diet: Vegan
    Servings: 10 slices
    Calories: 283kcal
    Author: Amanda Logan

    Equipment

    • 9x9" baking pan

    Ingredients 

    Wet Ingredients

    • ½ cup vegan butter melted and then cooled (125g)
    • 1 teaspoon vanilla extract
    • ½ cup apple sauce 130g
    • ½ cup raw sugar or brown for a more caramel flavour, 125g

    Dry Ingredients

    • ¾ cup all-purpose flour 113g
    • ¾ cup wholemeal flour 113g
    • 1 teaspoon ground cinnamon 5g
    • 2 teaspoon baking powder 10g
    • 1 cup rolled oats 100g
    • ¼ teaspoon sea salt
    • ⅔ cup desiccated coconut 55g
    • ½ cup sultanas approx 80g

    Instructions

    • Pre-heat oven to 170℃ (340℉) and line a 9x9" baking pan.
    • Add the butter, sugar and vanilla to a saucepan and gently melt together over low-medium heat. The sugar doesn't need to be completely dissolved, but we want the butter nice and melty.
    • Remove from the heat and add the apple sauce and give it a good whisk. Set aside.
    • Combine the dry ingredients, except the sultanas, to a medium-large mixing bowl.
    • Add the melted butter mixture to the dry ingredients and stir until almost combined and then throw in the sultanas and fold them through.
    • Transfer the mixture to the lined baking pan and press down firmly to level and compact.
      Side-by-side images of dough in a baking pan.
    • Pop in the oven and bake for 20-25 minutes or until lightly golden. Remove from the oven and allow to cool for 15-minutes before slicing into bars.
    • Cool the bars completely before storing in an airtight container for up to 5 days.
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    Notes

    Ingredients Notes:
    Vegan buttery spread. Using butter gives this oat slice shortbread vibes.
    Raw sugar. I always use raw sugar in my cooking, but you could also use brown.
    Two flours. Yes, I know - it's a pain in the butt. But adding whole flour to the recipe adds fibre and a little nuttiness. You can just use all-purpose flour, if you like.
    Apple sauce. Besides adding sweetness, the pectin in apple sauce helps to hold the slice together. I use it in my vegan vanilla cupcakes and it binds like a dream.
    Desiccated coconut. Use the smaller desiccated coconut flakes rather than shredded coconut. Small flakes are best here to help with binding.
    Dried fruit. I pretty much always use sultanas in this slice, but you could swap them out for currants, chopped dried apricots or any dried fruit you like.

    Nutrition

    Calories: 283kcal | Carbohydrates: 40g | Protein: 4g | Fat: 13g | Saturated Fat: 6g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 4g | Trans Fat: 0.1g | Sodium: 142mg | Potassium: 265mg | Fiber: 4g | Sugar: 17g | Vitamin A: 461IU | Vitamin C: 0.5mg | Calcium: 54mg | Iron: 2mg
    Tried It?I'd love to hear your feedback. Rate it & leave your feedback in the comments section below. Or you can tag @mygoodnesskitchen or hashtag #mygoodnesskitchen on Instagram.
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