In a bowl, whisk together the flour and salt. Add the cold vegan margarine and rub it in with your fingertips until the mixture resembles coarse breadcrumbs.
Add the cold water and mix until a dough forms. Shape it into a ball, wrap in plastic wrap, and refrigerate for 30 minutes.
Heat the olive oil in a skillet over medium heat. Sauté the minced garlic for 1 minute. Add the spinach and cook until wilted.
Place the tofu, plant-based milk, nutritional yeast flakes, nutmeg, salt, and pepper in a blender and purée until smooth.
Roll out the dough to about 3-4 mm thickness and line a quiche dish with it. Prick the base with a fork and blind bake at 350°F (180°C) for 10 minutes.
Combine the spinach with the tofu cream and pour it into the pre-baked crust.
Bake the quiche at 350°F (180°C) for another 25-30 minutes, or until the top is golden brown.
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