Vegan Quiche

Name: Vegan Quiche
Prep time: 15 min
Cook time: 35 min
Total time: 50 min
Yield: 6
Ingredients: Ingredients; Crust (Optional, Use Store-Bought or Skip for Crustless Quiche); 1 1/4 cups all-purpose flour (or gluten-free flour); 1/4 teaspoon salt; 1/3 cup coconut oil or vegan butter, cold and cut into small pieces; 3-4 tablespoons cold water; Filling; 1 block (14 oz) firm tofu, drained and pressed; 1/2 cup unsweetened plant-based milk (almond, oat, or soy); 1/4 cup nutritional yeast; 1 tablespoon olive oil; 2 tablespoons cornstarch (or arrowroot powder); 1 teaspoon Dijon mustard; 1/2 teaspoon garlic powder; 1/2 teaspoon onion powder; 1/2 teaspoon turmeric (for color); 1/2 teaspoon salt; 1/4 teaspoon black pepper; 1 teaspoon lemon juice; 1/2 cup mushrooms, sliced; 1/2 cup spinach or kale, chopped; 1/2 red bell pepper, diced; 1/4 cup cherry tomatoes, halved; 2 green onions, chopped; 1/4 cup dairy-free cheese (optional)