Sunday Brunch: Baked Blintz Cake with Fresh Blueberry Sauce Recipe

Name: Sunday Brunch: Baked Blintz Cake with Fresh Blueberry Sauce Recipe
Ingredients: 3/4 cup fresh orange juice (from 3 oranges); 1 tablespoon cornstarch; 1 cup plus 2 tablespoons sugar; 2 pounds fresh blueberries; 4 teaspoons grated lemon zest (I used 3 lemons); 3 tablespoons fresh lemon juice; 1 1/4 cups whole milk; 2 tablespoons sour cream or plain yogurt; 4 tablespoons melted butter; 1 1/3 cups flour; 1 tablespoons baking powder; 1 1/2 teaspoons vanilla; 6 eggs; 24 ounces (3 cups) ricotta; 8 ounces mascarpone; 1 teaspoon kosher salt