Croatian Mađarica Recipe (Layered Chocolate Slice)

Name: Croatian Mađarica Recipe (Layered Chocolate Slice)
Cuisine: European, Eastern European
Ingredients: 600 g all-purpose flour (4 cups); 1/2 tsp. baking powder; Two egg whites; 220 ml cream (1 cup); 150 g sugar (3/4 cup); 180 g butter (13 Tbls.); 1 L milk (4 1/4 cups); 140 g butter (10 Tbls.); 200 g sugar (1 cup); 200 g chocolate (7 oz); 5 Tbls. all-purpose flour; 1 tsp. vanilla extract; 180 g chocolate (6.3 oz); 3 Tbls. oil; 50 g butter (3 1/2 tablespoons)