Polenta Pound Cake with Peach Topping and Mascarpone Whipped Cream

Name: Polenta Pound Cake with Peach Topping and Mascarpone Whipped Cream
Ingredients: Nonstick cooking spray, for the pan; 1 cup all-purpose flour; 1 cup instant polenta; 1 3/4 teaspoons baking powder; 1/2 teaspoon kosher salt; 10 tablespoons unsalted butter, at room temperature; 1 cup granulated sugar; 2 large eggs plus 1 large egg yolk; 1 cup whole-milk ricotta; 1/4 cup Greek yogurt; 2 teaspoons vanilla extract; Zest of 1 orange; 12 ounces orange marmalade; Juice of 1 orange; 1 peach, pitted and sliced; 2 cups heavy cream; 2 tablespoons confectioners' sugar; 1/3 cup mascarpone; 1 teaspoon vanilla extract