3 potato tart gruyeere Recipes

all-purpose flour, salt, white pepper, freshly ground black pepper, ground red pepper, chilled butter, cut into small pieces, ice water, yukon gold potatoes (about 1 lb), chopped onion, water, fresh spinach, salt, divided, shredded gruyere cheese, divided, carton egg substitute

refrigerated breadstick dough (such as pillsbury ), vegetable oil, sliced leek (about 1 large), black pepper, peeled baking potato , halved lengthwise and cut into 1/4-inch-thick slices (about 1 cup), fat-free milk, egg substitute, grated gruyere or swiss cheese, grated fresh parmesan cheese, dijon mustard