To prepare a spinach and smoked gouda crustless quiche recipe, you will first need to prepare the filling. Preheat the oven to 425?F (205?C) and prepare your oven rack to line the bottom of the pie dish with parchment paper. Place the spinach, ricotta, goat cheese, Parmesan cheese and salt and pepper to taste in the bowl of an electric stand mixer fitted with the paddle attachment. Beat the mixture on medium-high speed until the cheese is melted and the ingredients are evenly combined. Add the egg and milk and mix to combine. Pour the batter into the pastry shell and bake for 30 minutes or until browned.