Preheat the oven to 375°F (190°C) and place the vegan pie crust into a pie dish.
Lightly prick the bottom of the crust with a fork to prevent bubbling.
Heat olive oil in a skillet over medium heat.
Add chopped asparagus and green onions and sauté for 3–4 minutes until slightly tender.
Stir in the chopped spinach and cook for 1–2 minutes until wilted. Remove from heat.
In a blender or food processor, combine tofu, plant milk, nutritional yeast, Dijon mustard, turmeric, salt, and black pepper.
Blend until smooth and creamy to create the custard-like filling.
Spread the sautéed vegetables and cherry tomatoes evenly over the pie crust.
Pour the tofu mixture over the vegetables and spread evenly.
Bake for 35–40 minutes until the filling is firm and lightly golden.
Allow the quiche to cool for 10–15 minutes before slicing.
Garnish with fresh herbs, vegan cheese, or red pepper flakes before serving.