Traditional Irish Oat Flapjacks are the ultimate treat for anyone who loves wholesome, comforting baked goods. These golden, chewy bars are packed with hearty oats, offering a satisfying texture that’s both crisp on the edges and delightfully soft in the center.
With just 15 minutes of prep and 40 minutes of baking, you’ll have a batch of these irresistible treats ready to enjoy.
Warm, buttery, and subtly sweet, these flapjacks are perfect for breakfast, a midday snack, or even dessert. The rich aroma of toasted oats and caramelized sugar will fill your kitchen, making it impossible to resist sneaking a bite. Simple yet indulgent, they’re a timeless recipe that brings a touch of Irish charm to your table.
What You’ll Need

- 1 ½ cups (12 oz/340 g) butter, softened (unsalted recommended for better control of flavor)
- 1 cup (8 oz/225 g) granulated sugar (can substitute with brown sugar for a deeper flavor)
- 2 tablespoons golden syrup (honey or maple syrup can be used as alternatives)
- 1 teaspoon vanilla extract (use pure vanilla for the best flavor)
- ¼ teaspoon salt (enhances the sweetness)
- 5 ⅓ cups (16 oz/450 g) rolled oats (ensure they are gluten-free if needed)
How to Make Traditional Irish Oat Flapjacks
- Preheat the oven to 350°F (180°C). Butter and line a 9 x 13-inch pan with parchment paper. Set aside.
- In a medium saucepan over medium heat, combine the butter, sugar, golden syrup, vanilla, and salt. Stir until the butter is melted and the sugar is fully dissolved.
- Remove from heat and stir in the rolled oats until they are evenly coated with the butter mixture.
- Spread the mixture evenly into the prepared pan, pressing it down firmly with a spatula or the back of a spoon.
- Bake for 30 to 35 minutes, or until the top is lightly golden brown.
- Let cool in the pan for 10 minutes, then cut into 16 squares using a sharp knife.
- Transfer the squares to a wire rack to cool completely. Store in an airtight container for up to 5 days.
Perfect Pairings: Sauce and Topping Ideas
Elevate your Traditional Irish Oat Flapjacks with a drizzle of warm honey or a dollop of clotted cream for a touch of indulgence. For a fruity twist, serve with a side of fresh berries or a spoonful of tangy lemon curd. If you’re feeling adventurous, a sprinkle of sea salt or a dusting of powdered sugar can add a delightful contrast.
Smart Storage: Keep Them Fresh
Store your flapjacks in an airtight container at room temperature for up to 5 days. For longer storage, wrap them individually in parchment paper and freeze for up to 3 months. To enjoy, simply thaw at room temperature or warm them in the oven for a few minutes to revive their crisp texture.
Quick Variations: Customize Your Flapjacks
Add a handful of dried cranberries, chopped nuts, or dark chocolate chips to the oat mixture for extra flavor and texture. For a healthier twist, swap half the butter with unsweetened applesauce and reduce the sugar by a quarter cup. These small tweaks can make the recipe uniquely yours!
Time-Saving Tips: Streamline Your Prep
Use a microwave-safe bowl to melt the butter, sugar, and golden syrup together in 30-second intervals, stirring in between. This method saves time and reduces cleanup. Additionally, measure out all your ingredients before starting to ensure a smooth and efficient cooking process.
Essential Equipment: Tools for Success
A sturdy 9 x 13-inch baking pan and a reliable silicone spatula are key for this recipe. Lining the pan with parchment paper ensures easy removal and cleanup. If you don’t have golden syrup, light corn syrup or maple syrup can be used as a substitute without compromising the flavor.
Traditional Irish Oat Flapjacks
Ingredients
- 1 ½ cups butter, softened
- 1 cup granulated sugar
- 2 tablespoons golden syrup
- 1 teaspoon vanilla extract
- ¼ teaspoon salt
- 5 ⅓ cups rolled oats
Instructions
- Preheat the oven to 350°F (180°C) and butter and line an 9 x 13-inch pan. Set aside.
- In a medium saucepan over medium heat, combine the butter, sugar, golden syrup, vanilla and salt until the butter is melted and the sugar is dissolved.
- Remove from the heat and stir in the oats until well-coated.
- Spread the mixture evenly in the prepared pan and bake for 30 to 35 minutes, until lightly browned on top.
- Let cool in the pan for 10 minutes, then cut into 16 squares and transfer to a wire rack to cool completely.
- Store in an airtight container for up to 5 days.