Gluten-free quiche Lorraine

Name: Gluten-free quiche Lorraine
Prep time: 1 h 10 min
Cook time: 55 min
Total time: 2 h 5 min
Cuisine: French
Ingredients: 100g rice flour; 2 1/2 tablespoons gluten-free cornflour; 2 1/2 tablespoons polenta; 1 teaspoon salt; 1/2 teaspoon gluten-free baking powder; 125g unsalted butter, chilled, chopped; 200g cold mashed potato; 1 tablespoon sesame seeds, toasted; 150g sliced leg ham, finely chopped; 4 egg yolks; 3 eggs; 1 cup pure cream; 1/2 teaspoon ground nutmeg; Salad leaves, to serve