To prepare a vanilla and chocolate conchas recipe, first you need to gather your ingredients. First, you'll need the following ingredients: 12 cup vanilla extract 2 tablespoons confectioners' sugar 1 cup condensed milk 1/2 cup evaporated milk Instructions: Preheat the oven to 350?F (176?C) and grease and flour two 8-inch square baking pans. In the bowl of an electric mixer, cream the butter, sugar, and vanilla until light and fluffy. Add the eggs and beat them until they're stiff peaks. Gradually add the egg mixture to the vanilla mixture, beating well after each addition. Pour the batter into the prepared pan and bake for 20 to 25 minutes or until the tops are golden brown. Remove the pan from the heat and let the mixture cool for 5 minutes before serving.