Vegan Dollhouse - Vegan Tuna Casserole

Ingredients

• 1 onion, finely diced
• 2-3 tablespoons of olive oil (if you avoid oil, replace this with water)
• 1 pound of mushrooms, washed and sliced
• ¼ cup unbleached flour
• 1 ½ cups filtered water, boiling
• ½ cup nutritional yeast
• 1 teaspoon garlic powder
• 1 teaspoon pepper
• 2 teaspoons pink sea salt
• 2 tablespoons organic tamari or soy sauce
• 1-2 cups grated vegan cheese (optional, but I used 1 ½ cups of violife cheddar)
• 16 ounces pasta
• 1 bag (1 pound) of frozen peas
• 1 package of vegan tuna, shredded (I like the one made by Layonna Vegetarian the best because it doesn't taste fishy. I've also used chickpeas in the place of tuna.)
• breadcrumbs or an alternative to bread crumbs (see substitutions section below for alternatives)