Strawberry Crumble Cake Bars - A Cup Full of Sprinkles

Ingredients

• 180 grams plain flour
• 1 teaspoon baking powder
• ¼ teaspoon salt
• 100 grams caster sugar
• 120 grams unsalted butter, softened
• 1 large egg, at room temperature
• 1 teaspoon vanilla extract
• 400 grams fresh strawberries, chopped
• 2–3 tablespoons caster sugar, adjust depending on sweetness of berries
• 1 tablespoon cornstarch
• 1 teaspoon lemon juice
• 70 grams plain flour
• 30 grams rolled oats
• 50 grams brown sugar
• 60 grams unsalted butter, cold
• Zest of ½ lemon