Blueberry Lemon Oat Squares

Name: Blueberry Lemon Oat Squares
Prep time: 15 min
Cook time: 25 min
Total time: 40 min
Yield: 12 squares
Ingredients: 2 cups rolled oats; 1 cup flour (or almond flour for a gluten-free option); 1/2 cup honey or maple syrup; 1/3 cup coconut oil or butter, melted; 1 teaspoon baking powder; 1/2 teaspoon salt; 1 cup fresh blueberries; Zest of 1 lemon; Juice of 1 lemon

Highlighted under: Modern Baking Ideas

I absolutely love creating treats that feel wholesome yet indulgent, and these Blueberry Lemon Oat Squares are my favorite! Combining bright lemon zest with juicy blueberries, they make for the perfect snack or dessert. The oats add a lovely texture, and the balance of sweetness from the honey brings everything together. It’s an easy recipe that even the kids can help with, making it a great weekend activity. I think you’ll find these squares irresistible!

Created by

Dorothy Finch

Last updated on 2026-02-07T20:20:38.017Z

When I first experimented with these Blueberry Lemon Oat Squares, I was amazed by how simple yet delicious they turned out. The combination of tart lemon and sweet blueberries creates a refreshing burst of flavor that keeps me coming back for more. I learned that using rolled oats instead of flour provides great texture and makes them more nutritious—what a win!

One of my favorite tips is to let the squares cool completely before slicing. This helps them set and makes for cleaner cuts, ensuring you enjoy perfect squares every time. I often double the recipe to share with friends, and they always ask for the secret!

Why You'll Love This Recipe
Zingy lemon flavor that brightens your day
Nutty oats provide a satisfying chew
Perfectly sweetened with fresh blueberries

Understanding the Ingredients

The base of these Blueberry Lemon Oat Squares is a combination of oats and flour, which create a hearty texture that complements the tartness of the blueberries. Rolled oats provide chewiness, while flour helps bind the mixture together. If you're looking for a gluten-free option, almond flour works wonderfully in this recipe, offering a subtle nutty flavor that enhances the overall taste profile.

Using honey or maple syrup as the sweetener not only adds sweetness but also imparts moisture to the squares, keeping them soft and tender. Honey lends a floral note, while maple syrup brings an earthy sweetness. Remember, if using maple syrup, reduce the baking temperature slightly (by about 10°F) to account for its higher water content, ensuring the squares bake evenly.

Baking Techniques

When pressing the oat mixture into the bottom of the baking dish, aim for an even layer, about half an inch thick. This will ensure that the squares hold together well after baking. Using the bottom of a measuring cup can help achieve a flat, uniform surface. Avoid overpacking, as you'll want some air pockets for the squares to rise slightly while baking.

Pay attention to the baking time—your squares should turn a beautiful golden brown around the edges after approximately 25 minutes. If the center seems too soft when you check them, give it an additional couple of minutes. They will firm up as they cool, so it's also a good idea to let them cool completely before slicing, allowing the flavors to meld beautifully.

Ingredients

For the Oat Mixture

2 cups rolled oats
1 cup flour (or almond flour for a gluten-free option)
1/2 cup honey or maple syrup
1/3 cup coconut oil or butter, melted
1 teaspoon baking powder
1/2 teaspoon salt

For the Topping

1 cup fresh blueberries
Zest of 1 lemon
Juice of 1 lemon

Instructions

Prepare the Oven

Preheat your oven to 350°F (175°C) and line a square baking dish with parchment paper, leaving some overhang for easy removal.

Mix Dry Ingredients

In a large bowl, combine rolled oats, flour, baking powder, and salt. Stir well until evenly distributed.

Add Wet Ingredients

In another bowl, mix honey (or maple syrup) with melted coconut oil, then add to the dry ingredients. Stir until fully combined.

Press and Bake

Press half of the oat mixture into the bottom of the prepared baking dish. Spread the blueberries evenly over this layer, then combine the lemon zest and juice. Finally, sprinkle the remaining oat mixture on top.

Bake the Squares

Bake for 25 minutes, or until the top is golden brown. Let cool completely before slicing into squares.

Pro Tips

For an extra touch, you can sprinkle some sliced almonds or chopped walnuts on top before baking for added crunch.

Storage and Make-Ahead Tips

These Blueberry Lemon Oat Squares can be made in advance and stored for up to a week in an airtight container at room temperature. To keep them fresh longer, consider refrigerating them, which can extend their shelf life by a few days. They also freeze well, so if you want to batch prep, slice them after cooling, layer parchment paper between pieces, and store in a freezer-safe bag.

When ready to enjoy, simply pull a square out of the freezer and let it thaw at room temperature for about 15 minutes, or pop it in the microwave for a quick 15 seconds to restore some warmth. They're delightful served cold, but if you prefer a warm treat, a quick zap in the microwave does wonders to enhance the flavors.

Variations and Add-Ins

While blueberries and lemon are a classic pairing, feel free to experiment with other fruits based on the season. Raspberries or diced strawberries can substitute for blueberries, and a mix of berries can provide a delightful burst of flavor and color. You can also add some chopped nuts like walnuts or pecans for an extra crunch.

For added depth, consider mixing in some spices like cinnamon or ginger to the oat mixture. A teaspoon of vanilla extract can also elevate the sweetness and warmth. If you prefer a less sweet square, reduce the honey by a couple of tablespoons—just make sure to monitor the texture, as the moisture content will change.

Questions About Recipes

→ Can I use frozen blueberries?

Yes, frozen blueberries work well! Just make sure to thaw and drain them before adding to the mixture.

→ How do I store the oat squares?

Store them in an airtight container at room temperature for up to 5 days, or refrigerate for longer freshness.

→ Can I substitute the honey?

Absolutely! You can use maple syrup or agave nectar if you prefer a vegan option.

→ What other fruits can I add?

Feel free to get creative! Chopped strawberries or raspberries would also be delicious in this recipe.