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Preheat oven to 375°F (190°C).
Roll out the pie crust and press it into a 9-inch quiche dish or pie plate. Prick the bottom with a fork. Pre-bake the crust for 8 minutes. Remove from oven.
In a skillet, heat olive oil over medium heat. Add the onion and sauté until translucent, about 5 minutes. Add the spinach and cook until wilted, about 2 minutes. Remove from heat and let cool.
