Sauté onions, carrot, red bell pepper and celery in 2 tablespoons of vegetable oil until softened.
Add lemon juice, water and cauliflower to the pan.
Stir to mix all vegetables together and cover the pan.
Steam on low for about 10 minutes or until cauliflower is tender.
Stir vegan cream cheese, 2 teaspoons of nutritional yeast and salt to taste into the cauliflower.
In a bowl, mix panko crumbs, 2 teaspoons of nutritional yeast, 1 teaspoon salt and 1 tablespoon of vegetable oil and sprinkle on top of cauliflower.
Broil for 1 minute or so (watch it closely) until the topping is browned