Preheat the oven to 350°F (180°C) and prepare a 9-inch (22-24 cm) pie dish. Lightly grease it with olive oil to prevent the crust from sticking.
In a large bowl, whisk together the lentil flour and water. Add the turmeric, salt, pepper, and basil. Whisk until you have a smooth, lump-free batter. Let it rest for 10 minutes.
Meanwhile, prepare the vegetables: finely chop the onion, garlic, bell pepper, zucchini, and spinach. Chopping the vegetables uniformly ensures even cooking.
Heat 1 tablespoon of olive oil in a skillet over medium heat. Sauté the onion for 2-3 minutes, then add the garlic, zucchini, and bell pepper. Cook together for 5-6 minutes. Add the spinach during the last 1-2 minutes, until wilted.
Combine the sautéed vegetables with the rested lentil flour batter. Mix well to ensure they are evenly distributed throughout.
Pour the mixture into the prepared pie dish and smooth the top. If desired, drizzle a little olive oil over the top to help it brown nicely while baking.
Bake the quiche for 35-40 minutes at 350°F (180°C), or until the top is set and lightly golden brown. You can check if it's cooked through by inserting a toothpick into the center – it should come out clean.
After baking, let it cool for 10-15 minutes for easier slicing. Enjoy warm or cold – it's excellent served with a salad.
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