Baked Apricot Slice

Name: Baked Apricot Slice
Prep time: 20 min
Cook time: 40 min
Total time: 1 h
Cuisine: American
Ingredients: 150g butter, softened; 1 cup sugar; 1 egg; 1 tsp vanilla essence; 2 cups plain flour; 1 tsp baking powder; 1 Tbsp icing sugar; 2 x 410g cans of apricots; ⅓ cup reserved apricot juice; ¼ cup sugar; 1 Tbsp cornflour