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Homemade jam slices with oat topping on a white table.

Wild Berry Jam Slice

Buttery, brown sugar jam slice the perfect easy baking recipe. Homemade jam and an oat layer, these bars are part jam slice part crumble bar.
5 from 1 vote
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Course: Easy Baking
Cuisine: British
Prep Time: 25 minutes
Cook Time: 30 minutes
Servings: 16 Squares

Ingredients

  • 1 kg (6 cups) of mixed frozen berries
  • 100 g (½ cups) caster sugar
  • 3 tablespoons (3 tablespoons) corn starch
  • 1 (1) lemon, juice only
  • For the topping
  • 225 g (1 5/7 cups) plain flour
  • 225 g (1 cups) butter, cold cut into cubes
  • 125 g (1 ½ cups) rolled oats, not quick-cooking
  • 250 g (1 cups) brown sugar, light or dark

Instructions

  • Preheat the oven to 160ºC fan or 170ºC regular.
  • Stir the fruit with the caster sugar in a medium saucepan. Cook over medium heat until the fruit is broken down and the sugar has melted. This should take about 10-15 minutes. Mix the lemon juice with the corn starch. Add it to the fruit mixture and stir in. Bring back to a simmer for about 1 minute. Remove from the heat and place in the fridge or the freezer to cool while you make the crumble topping.
  • Place the flour, brown sugar and rolled oats into a medium mixing bowl. Using a fork or just your hands cut the butter into the flour oat mixture until it resembles very chunky coarse breadcrumbs.
  • Line a 22cm square (9x9) tin with baking paper. Firmly press ½ the crumble mixture into the bottom of the tin. Pour the cooled jam on top and spread evenly with a spoon or knife. Crumble the remaining oat mixture over the jam. 
  • Bake in the preheated oven for about 25-30 minutes, until the jam is starting to bubble up around the edges and the crumble topping is golden and crisp. Cool for about 30 minutes in the fridge and cut into 16 squares.

Notes

  1. The jam gets made with the berries still frozen. No need to defrost.
  2. Light brown or dark brown sugar is perfect in the oat crumble.
  3. It’s really important to chill the bars before cutting. If they don’t chill first they tend to fall apart while being cut. 
  4. Use rolled oats, not quick-cooking.

Nutrition

Calories: 304kcal | Carbohydrates: 47g | Protein: 3g | Fat: 12g | Saturated Fat: 7g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 3g | Trans Fat: 1g | Cholesterol: 30mg | Sodium: 106mg | Potassium: 164mg | Fiber: 5g | Sugar: 26g | Vitamin A: 395IU | Vitamin C: 6mg | Calcium: 41mg | Iron: 2mg
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