Blackberry–Apple Oat Crumble Bars

Soft baked fruit layered over a wholesome oat base with minimal added sugar, making a fiber-rich, lunchbox-friendly snack that’s sweet, succulent, and satisfying without being heavy.

Ingredients

• 300 g apples (about 2 medium), peeled or unpeeled, grated (coarse)
• 200 g blackberries (fresh or frozen)
• 25 g honey or maple syrup (optional, for a sweeter bar)
• 10 g lemon juice (about 2 tsp) *(or use a splash of apple cider vinegar if that’s what you have)*
• 5 g ground cinnamon (about 2 tsp)
• 1 g fine salt (about 1/4 tsp)
• 180 g rolled oats
• 120 g whole wheat flour *(or plain flour)*
• 6 g baking powder (about 1 1/2 tsp)
• 60 g neutral oil (canola/vegetable/olive oil)
• 80 g unsweetened applesauce *(helps keep fat low and bars tender)*
• 1 large egg (about 50 g, without shell) *(or 30 g extra applesauce for egg-free, slightly softer bars)*

Method

• 1

  Step 1: Prep the pan & oven

  Heat oven to **180°C** (160°C fan). Line an **20 cm square pan** with baking paper so it overhangs on two sides (easy lift-out).

• 2

  Step 2: Cook down the fruit (quick jammy filling)

  Add **grated apple (300 g)**, **blackberries (200 g)**, **lemon juice (10 g)**, **cinnamon (5 g)**, **salt (1 g)** and **honey/maple (25 g, optional)** to a saucepan. Cook on medium heat for **6–8 minutes**, stirring often, until the fruit is **soft, glossy, and slightly thickened** (the pan shouldn’t look watery).

• 3

  Step 3: Mix the oat base

  In a bowl, mix **rolled oats (180 g)**, **whole wheat flour (120 g)** and **baking powder (6 g)**. Add **oil (60 g)**, **applesauce (80 g)** and **egg (50 g)**. Stir until you have a **crumbly, damp mixture** that holds together when squeezed.

• 4

  Step 4: Press in the base

  Tip **about 2/3** of the oat mixture into the lined pan. Press firmly into an even layer (use the base of a cup). This helps the bars slice neatly for lunchboxes.

• 5

  Step 5: Add filling & crumble topping

  Spread the warm fruit mixture evenly over the base. Sprinkle the remaining oat mixture over the top, pinching a few clumps for a “crumble” look.

• 6

  Step 6: Bake

  Bake for **28–32 minutes** until the top is **lightly golden** and the edges look **set**.

• 7

  Step 7: Cool (this is the secret to clean slices)

  Cool in the pan for **20 minutes**, then lift out using paper overhang. Cool **fully** (at least **1 hour**) before slicing into **12 bars**.

Tips

• **Lunchbox win:** Wrap bars individually once cooled; they hold together best after a few hours (or overnight) as the oats absorb moisture.
• **Frozen blackberries:** Use straight from frozen—just cook the filling a minute or two longer until jammy.
• **Sweeter vs. more “grown-up”:** For lunchbox-kid sweet, include the **25 g honey/maple**. For naturally sweet, omit it (apples carry the sweetness).
• **Make it extra hearty:** Swap **30–40 g** of the flour for **ground flaxseed or chia** if you have it (adds fiber and omega-3s).
• **Storage:** Keep airtight **3 days at room temp** or **6 days in the fridge**. Freeze up to **2 months**; thaw overnight in the fridge.
• **Serve with:** A smear of **plain yogurt** on the side (if available) turns it into a more filling snack with extra protein.

Nutrition (per serving, estimate)