Crustless Spinach Quiche

Name: Crustless Spinach Quiche
Ingredients: Extra-virgin olive oil, for greasing and drizzling; 4 ounces smoked gouda cheese, cut into 4 pieces; 1 10-ounce package frozen spinach, thawed and squeezed dry; 2 large eggs plus 2 egg whites; 1 15-ounce container part-skim ricotta cheese; 2 tablespoons all-purpose flour; 1/2 teaspoon freshly grated nutmeg; 6 to 8 scallions, chopped; 1 tablespoon grated parmesan cheese; 1 teaspoon paprika; 2 heads endive, sliced lengthwise; 2 tablespoons chopped walnuts