Best Apple Crumble Recipe

Ingredients

• 6 large Granny Smith apples - peeled, cored and chopped
• 2 tablespoons white sugar
• 1/2 cup butter
• 1 egg
• 2 cups all-purpose flour
• 1 teaspoon baking powder
• 1/4 cup custard powder
• 3/4 cup white sugar
• 3/4 cup butter
• 1 1/4 cups all-purpose flour
• 2 teaspoons ground cinnamon
• 1/3 cup shredded coconut
• 1/3 cup rolled oats