Potato-Spinach Casserole with Trumpet Mushrooms

Ingredients (for 8 servings)

• 2 lb — Yukon Gold potatoes
• 2 cup — yellow onion
• 2 cup — trumpet mushrooms
• 4 tsp — garlic powder
• 2 tsp — thyme
• 4 cup — spinach
• 0 whole — Sea salt
• 0 whole — black pepper
• 7 oz — tofu
• 2.75 cup — plant-based milk
• 0.5 cup — chickpea flour
• 1 cup — brown rice flour
• 0.5 cup — nutritional yeast
• 1.5 tsp — baking powder
• 1 tsp — black salt or sea salt
• 0.25 tsp — turmeric
• 0.25 tsp — black pepper