Cheese Slice

2 1/2 cup plain flour\r
1 tsp vanilla\r
1 1/2 tsp baking powder\r
3/4 cup sugar\r
2 cups grated cheese (200 g) 1 cup for the batter and 1 cup for the topping\r
3/4 cup butter\r
2 eggs\r
1 can 395 g condensed milk \r
Optional \r
1/3 cup white choc chips