Strawberry Rhubarb Crumb Bars

Bahan-bahan (18 porsi)

• 3 cups (375g) all-purpose flour (spooned & leveled)
• 1/2 cup (100g) granulated sugar
• 1/2 cup (100g) packed light or dark brown sugar
• 1 teaspoon baking powder
• 1/2 teaspoon ground cinnamon (optional)
• 1/4 teaspoon salt
• 1 cup (16 Tbsp; 226g) unsalted butter, cold and cubed
• 1 large egg
• 2 teaspoons pure vanilla extract
• 1/4 cup (60ml) milk
• 1/3 cup (28g) old-fashioned whole rolled oats*
• 2 and 1/2 cups (about 380g) chopped strawberries
• 2 and 1/2 cups (250g) sliced rhubarb (1/2 inch pieces)
• 1/2 cup (100g) granulated sugar
• 1 Tablespoon cornstarch
• 1 teaspoon orange zest