Sweet Potato Cheesecake Bars

Name: Sweet Potato Cheesecake Bars
Prep time: 15 min
Cook time: 2 h
Total time: 2 h
Yield: 20 pieces
Ingredients: 80 - 90 g sugar; 80 g butter; 150 g plain flour; 4 eggs; 20 g unsweetened cocoa powder; ½ tsp baking powder; 1 - 2 pinches salt; 600 g water; 300 g sweet potatoes; 500 g ricotta cheese; 200 g cream cheese; 140 - 100 g sweetened condensed milk; 20 g cornflour (starch); 1 tsp natural vanilla extract