To prepare an olive garden tiramisu dessert cheese recipe, first you need to prepare the ingredients. In a medium mixing bowl, combine the ricotta cheese, sour cream, sugar, and vanilla. Beat the mixture with an electric mixer until it's light and fluffy, about 5 minutes. Add the egg yolks and beat them until they're stiff peaks. Gradually add the milk, beating well after each addition. Pour the cheese mixture into an ungreased 9 x 13-inch baking pan. Bake in the preheated oven for 1 hour and 15 minutes, or until the top is golden brown. Remove the pan from the oven and let it cool completely before cutting into squares.